Atrial Fibrillation in Indigenous Australians: A Multisite Screening Study Using a Single-Lead ECG Device in Aboriginal Primary Health Settings.

BACKGROUND: Circulatory diseases continue to be the greatest cause of mortality for Australian Aboriginal and Torres Strait Islander people, and a major cause of persistently lower life expectancy compared with non-Aboriginal Australians. The limited information that exists on atrial fibrillation (AF) prevalence in Aboriginal and Torres Strait Islander communities is mostly based on hospital admission data. This shows AF as principal or additional admission diagnosis was 1.4 times higher compared to non-Aboriginal Australians, a higher incidence of AF across the adult life span after age 20 years and a significantly higher prevalence among younger patients. Our study estimates the first national community prevalence and age distribution of AF (including paroxysmal) in Australian Aboriginal people. A handheld single-lead electrocardiograph (ECG) device (iECG), known to be acceptable in this population, was used to record participant ECGs. METHODS: This co-designed, descriptive cross-sectional study was conducted in partnership with 16 Aboriginal Community Controlled Health organisations at their facilities and/or with their services delivered elsewhere. The study was also conducted at one state community event. Three (3) Australian jurisdictions were involved: New South Wales, Western Australia and the Northern Territory. Study sites were located in remote, regional and urban areas. Opportunistic recruitment occurred between June 2016 and December 2017. People <45 years of age were excluded. RESULTS: Thirty (30) of 619 Aboriginal people received a 'Possible AF' and 81 an 'Unclassified' result from a hand-held smartphone ECG device. A final diagnosis of AF was made in 29 participants (4.7%; 95%CI 3.0-6.4%), 25 with known AF (five paroxysmal), and four with previously unknown AF. Three (3) of the four with unknown AF were aged between 55-64 years, consistent with a younger age of AF onset in Aboriginal people. Estimated AF prevalence increased with age and was higher in those aged >55 years than the general population (7.2% compared with 5.4%). Slightly more men than women were diagnosed with AF. CONCLUSIONS: This study is a significant contribution to the evidence which supports screening for AF in Aboriginal and Torres Strait Islander people commencing at a younger age than as recommended in the Australian guidelines (>65 years). We recommend the age of 55 years. Consideration should be given to the inclusion of AF screening in the Australian Government Department of Health annual 'Aboriginal and Torres Strait Islander Health Assessment'. CLINICAL TRIAL REGISTRATION: ACTRN12616000459426.

A graduate oral health therapist program to support dental service delivery and oral health promotion in Aboriginal communities in New South Wales, Australia.

INTRODUCTION: The early closure of the Voluntary Dental Graduate Year Program and the Oral Health Therapy Graduate Year Program by the Australian Government adversely impacted New South Wales (NSW) Aboriginal Community Controlled Health Services (ACCHSs). This led to the co-design of a small-scale oral health therapy graduate year program for ACCHSs known as the Dalang Project, which enabled oral health therapists to engage with local Aboriginal communities and implement culturally competent, practical and evidence-based oral health promotion activities. This article provides an overview of the Dalang Project and its evaluation. METHODS: All graduates of the Dalang Project were invited via email and social media to complete an online survey. The survey included questions about their year in the Dalang Project, why they applied, what they liked and disliked about the project, where they planned to work post-placement, and examples of the most significant changes they observed in the communities where they were placed. Host sites were also surveyed and data were collated on clinical services performed as well as oral health promotion activity. RESULTS: Prior to commencing the Dalang Project only 4 of the 15 respondents came from rural or regional areas. Nine of the 15 respondents were considering working in a regional, rural or remote area prior to applying for the Dalang Project. Twelve respondents were working at the time of the survey and half were working in regional, rural or remote locations in NSW and one in the Northern Territory. All reported that they would be more likely to work in an ACCHS as a result of being a part of the Dalang Project. The majority of respondents said they would recommend the program to future graduates. A total of 63 schools, 21 preschools and 15 community health services received regular dental health education through the Dalang Project. A total of 3250 toothbrushes and fluoride toothpastes were distributed to children and families through the Dalang Project. A key part of the program was the installation of refrigerated and filtered water fountains in schools where there was no free filtered or refrigerated water supply. The inclusion of this component in the program was part of the co-design process and links the program to the wider population health strategies in NSW to help prevent childhood obesity. CONCLUSION: The Dalang Project is an example of a successful co-designed project that has positively impacted oral health service delivery for Aboriginal children and has provided a valuable experience for new graduate oral health therapists working in ACCHSs. Overall, the Dalang Project was found to be a positive professional experience for the oral health therapists with many remaining in rural, remote and regional locations after completing the program.

Community based programs to improve the oral health of Australian Indigenous adolescents: a systematic review and recommendations to guide future strategies.

BACKGROUND: To review the international literature on community-based interventions aiming to improve the oral health of Indigenous adolescents and identify which demonstrate a positive impact. METHODS: Data sources were MEDLINE, EMBASE, CINAHL, SCOPUS, the COCHRANE library and the Australian Indigenous HealthInfoNet. Articles were included where they: were published in English from 1990 onwards; described oral health outcomes for Indigenous adolescents aged 10 to 19 years; implemented a community based oral health intervention. The Quality Assessment Tool for Quantitative Studies from the Effective Public Health Practice Project was applied. RESULTS: Nine studies met inclusion criteria; two rated strong in quality; only one study was conducted with an urban community; five reported moderate community engagement. Five intervention strategies were identified, and schools were the most common setting reported. Statistically significant improvements were described in eight studies with the most frequently reported outcome being change in decayed missing or filled teeth. CONCLUSIONS: Few good quality peer reviewed international studies of community-based oral health interventions which address the needs of Indigenous adolescents exist. Studies must include strong Indigenous community leadership and governance at all stages of the research, adopt participatory action-based research approaches, and are required in urban communities.

A school fluoride varnish program for Aboriginal children in rural New South Wales, Australia.

ISSUE ADDRESSED: Australian Aboriginal children are less likely to access preventive oral health services such as fluoride varnish. The regular application of fluoride varnish can prevent dental caries. This study aims to determine if a school-based fluoride varnish program can provide Aboriginal children with at least three fluoride varnish applications over 12 months and whether the routine application of fluoride varnish for Aboriginal children in schools is a feasible approach for oral health promotion in Aboriginal communities. METHODS: A school fluoride varnish program was co-designed with Aboriginal communities in Central Northern New South Wales, Australia and implemented in three schools where majority of enrolled children are Aboriginal. Four "fluoride varnish days," 3 months apart, were held at each school over the 12-month study period. On each "fluoride varnish day" an oral health therapist applied fluoride varnish to all children included in the study. RESULTS: This study took place between January and December 2017. About 153 children were eligible to participate and 131 (86%) were consented into the program by a parent or guardian. A total of 104 children were enrolled for the entire 12-month study period and included in the analysis. Majority of children (65.4%) received at least three fluoride varnish applications, with an average of 70% of students receiving an application of fluoride varnish on each "fluoride varnish day." CONCLUSIONS: School-based fluoride varnish programs, co-designed with local Aboriginal communities, may be a feasible approach to oral health promotion aimed at improving the oral health of Aboriginal children. SUMMARY: This study aimed to improve access to fluoride varnish for Aboriginal children in Central Northern NSW. Four "fluoride varnish days," each three months apart, were held in three schools over 12 months. Majority of children (65.4%) received at least three fluoride varnish applications during the fluoride varnish program.

Aboriginal dental assistants can safely apply fluoride varnish in regional, rural and remote primary schools in New South Wales, Australia.

PROBLEM: There are significant inequalities in oral health status between Aboriginal and non-Aboriginal children in Australia, particularly where the children have insufficient access to various forms of fluoride. There has been a growing interest in seeing fluoride varnish programs used more widely for Aboriginal children due to proven effectiveness. Despite this, there has been limited scale-up of these programs in Australia. This study investigates the feasibility of using Aboriginal dental assistants to provide regular fluoride varnish applications for Aboriginal children in the primary school setting. DESIGN: A mixed-methods approach including auditing the number of Aboriginal dental assistants were trained and then approved by the NSW Chief Health Officer to apply fluoride varnish, and collection and reporting of participant data on the each of the fluoride varnish days in the local patient management system. SETTING: Six Aboriginal Community Controlled Health Services from regional NSW were invited to participate in the study. They also nominated a primary school and an Aboriginal dental assistant to participate in the study. KEY MEASURES FOR IMPROVEMENT: Data were obtained from four 'fluoride varnish days' held at the schools over a 12-month period between December 2017 and December 2018. The number of Aboriginal dental assistants were trained and then approved by the NSW Chief Health Officer to apply fluoride varnish is also reported. STRATEGIES FOR CHANGE: In total, 8 Aboriginal dental assistants were trained to apply fluoride varnish during the study. Overall, students participating in the study received three or more fluoride varnish applications. EFFECTS OF CHANGE: Results showed that Aboriginal dental assistants are able to safely and effectively apply fluoride varnish in a school setting with remote supervision. LESSONS LEARNT: This program can be scaled at the state level in NSW, and this could provide the basis for a nationally consistent program. Initial discussions have been held with several jurisdictions to lead this process via the Australian Health Ministers Advisory Council (AHMAC) based on the results of this study and the support of key stakeholders. The Poche Centre as part of its scale-up planning for the Fluoride Varnish Program is examining the feasibility of including the apply fluoride varnish skillset in its existing Aboriginal Dental Assistant Scholarship Program.

An assessment of strategies to control dental caries in Aboriginal children living in rural and remote communities in New South Wales, Australia.

BACKGROUND: A community-led oral health service for Aboriginal people in Central Northern NSW identified the need for oral health promotion, as well as dental treatment; in three remote communities with limited access to dental services. A three-stage plan based on the Precede-Proceed model was used to develop a school-based preventive oral health program. The program will be piloted in three schools over 12 months aimed at improving the oral health of local Aboriginal children. METHODS: The proposed program includes four components: daily in-school toothbrushing; distribution of free fluoride toothpaste and toothbrushes; in-school and community dental health education and the installation of refrigerated and chilled water fountains to supply a school water bottle program. Primary school children will be issued toothbrushing kits to be kept at school to facilitate daily brushing using a fluoride toothpaste under the supervision of trained teachers and/or Oral Health Aides. School children, parents and guardians will be issued free fluoride toothpaste and toothbrushes for home use at three-monthly intervals. Four dental health education sessions will be delivered to children at each school and parents/guardians at local community health centres over the 12 month pilot. Dental education will be delivered by an Oral Health Therapist and local Aboriginal Dental Assistant. The program will also facilitate the installation of refrigerated and filtered water fountain to ensure cold and filtered water is available at schools. A structured school water bottle program will encourage the consumption of water. A process evaluation will be undertaken to assess the efficiency, feasibility and effectiveness of the pilot program. DISCUSSION: The proposed program includes four core evidence-based components which can be implemented in rural and remote schools with a high Aboriginal population. Based on the Precede-Proceed model, this program seeks to empower the local Aboriginal community to achieve improved oral health outcomes. TRIAL REGISTRATION: TRN: ISRCTN16110292 Date of Registration: 20 June 2018.

A collaboration with local Aboriginal communities in rural New South Wales, Australia to determine the oral health needs of their children and develop a community-owned oral health promotion program.

INTRODUCTION: As part of an oral health service for Aboriginal people in central northern New South Wales (NSW), Australia, oral health promotion was identified as a priority by the local Aboriginal community. The objective of this study was to collaborate with local Aboriginal communities to determine (1) the oral health needs of Aboriginal children aged 5-12 years, (2) the oral health knowledge and attitudes towards oral health of parents/guardians and (3) the perceived barriers and enablers towards oral health promotion for school children by local school staff and community health workers. The results of this collaboration will inform a community-owned oral health promotion program. METHODS: Aboriginal children aged 5-12 years enrolled in local schools received a dental screening by a single examiner. The number of decayed, missing and filled teeth of primary and permanent dentition (dmft/DMFT), plaque and gingivitis were recorded. Children completed a questionnaire assessing current oral hygiene practices, dental history and information on their diet. Parents/guardians completed a questionnaire assessing oral health knowledge and attitudes towards oral health. School staff and community health workers completed a questionnaire assessing attitudes, barriers and enablers towards implementing an oral health promotion program in schools. RESULTS: Eighty-eight children, representing 94% of those eligible, were screened, and 78 (82%) completed a questionnaire. The mean dmft/DMFT score was 5.3. Risk factors for dental caries identified included lack of toothbrush ownership (35%), minimal fluoride toothpaste use (24%), limited daily tooth brushing (51%) and frequent consumption of sugary foods (72%) and soft drinks (64%). Questionnaires were completed by 32 parents/guardians and 39 school and community health workers. Parents/guardians had limited oral health knowledge. School and health staff were willing to support a health promotion program to improve dental health of children. CONCLUSION: Aboriginal children living in rural and remote communities in NSW experience high rates of dental caries. Oral health promotion is urgently required to reduce the burden of dental caries and should address oral hygiene behaviours, fluoride use and access to healthy foods and drinks. Note: This article uses the term 'Aboriginal people' when referring to the first peoples of Australia. This term is inclusive of Australian Aboriginal and Torres Strait Islander people.

INdigenous Systems and Policies Improved and Reimagined for Ear and hearing care (INSPIRE): a multi-method study protocol.

INTRODUCTION: Otitis media (middle ear disease) severity and chronicity among Aboriginal and Torres Strait Islander people, as well as gaps in socioeconomic outcomes related to hearing loss, indicates a breakdown in the current ear and hearing care system. The ear and hearing care system spans multiple sectors due to long-term impacts of otitis media and hearing loss in health, education and employment, necessitating a multi-disciplinary cross-sectorial approach to ear and hearing care. Public policies shape the current ear and hearing care system and here it is argued that a critical public policy analysis across different sectors is needed, with strong Aboriginal and Torres Strait Islander leadership and guidance. The current study aims to establish consensus-based ear and hearing care policy solutions for Aboriginal and Torres Strait Islander people in Australia. METHODS AND ANALYSIS: This multi-method study will be guided by a Brains Trust with strong Aboriginal and Torres Strait Islander leadership. Public policies in hearing health, social services, and education will be scoped to identify policy gaps, using the World Health Organization framework. Qualitative data will be collected through a culturally specific process of yarning circles to identify policy challenges and/or limitations in enabling accessible ear and hearing care programs/services for Aboriginal and Torres Strait Islander people, using dimensions of Morestin's public policy appraisal tool as an interview guide for stakeholders. Themes from the yarning circles will be used to inform an expert Delphi process to establish consensus-based policy solutions for optimising the ear and hearing care system for Aboriginal and Torres Strait Islander people. ETHICS AND DISSEMINATION: This study has approval from the Australian Institute of Aboriginal and Torres Strait Islander Studies Ethics Committee. Study findings will be disseminated to community through Brains Trust members and study participants, as well as through publications in peer-reviewed journals and research forum presentations.

The Progress of the New South Wales Aboriginal Oral Health Plan 2014-2020: A Scoping Review.

There are major disparities in oral health between Aboriginal and Torres Strait Islander and non-Aboriginal and Torres Strait Islander people. The New South Wales (NSW) Aboriginal Oral Health Plan 2014-2020 was developed to improve the oral health of Aboriginal people. This scoping review describes programs that have been undertaken to implement the NSW Aboriginal Oral Health Plan 2014-2020. The methodology by Arksey and O'Malley was used to guide this review. Academic and grey literature were searched using a structured Medline, Lowitja and advanced Google searches. Articles were included if they aligned with the strategic directions of the Plan. Key information, including the aims of the study, methodology and results were recorded in a template on Microsoft Excel software. A total of 31 articles were included in this review. This included 25 articles from the academic literature and six initiatives from the grey literature. Included articles were categorised according to the six strategic directions in the NSW Aboriginal Oral Health Plan. Four studies were related to the first strategic direction, six related to strategic direction two, four related to strategic direction three, six initiatives related to strategic direction four, five related to strategic direction five, and eight related to strategic direction six. While there has been significant progress in achieving the strategic directions of the NSW Aboriginal Oral Health Plan, there is scope for continued collaboration between oral health service providers, universities and Aboriginal communities to improve oral health outcomes for Aboriginal people in NSW.

Applying collective impact in Aboriginal health services and research: three case studies tell an important story.

BACKGROUND: Co-design is the latest buzzword in healthcare services and research and is ubiquitous in Australian funding grants and policy documents. There are no standards for what constitutes co-design and it is often confused with less collaborative processes such as consultation. Collective impact is a co-design tool used for complex and entrenched problems. It uses a systematic approach and requires power and resource sharing. We applied collective impact to three research projects with Aboriginal communities. This paper explores how collective impact can enhance participation and outcomes in healthcare services and research. METHODS: We evaluated the collective impact process and outcomes in three translational health research projects with Aboriginal people and communities using a case study approach. We adapted the model using an iterative co-design approach. RESULTS: We adapted the collective impact model in three ways: 1) replaced the precondition of 'problems that are urgent' with 'problems that are complex and entrenched'; 2) added to the 'common agenda' the requirement to establish a planned exit and long-term sustainability strategy from the outset; and 3) added the delivery of a public policy outcome as a result of the collective impact process. CONCLUSIONS: Aboriginal and Torres Strait Islander health is an important public policy priority that requires new and different approaches to service delivery and research. This study adapted the collective impact approach and developed the Rambaldini model through three translational health research case studies and found that a modified collective impact approach is an effective tool for engagement and outcomes.

Availability of drinking water in rural and remote communities in New South Wales, Australia.

Many rural communities in New South Wales (NSW), Australia, have poor-quality water supplies. The lack of a palatable alternative increases the risk of the high consumption of sugar-sweetened beverages, a significant contributor to adverse health outcomes. This disproportionately effects Aboriginal people living in these towns, who are also profoundly affected by the social determinants of health. Therefore, examining health inequalities linked to water access is important. This study investigated the availability of drinking water fountains in rural and remote communities in NSW. Telephone interviewer-assisted surveys were conducted with 32 representatives from local government councils or Local Aboriginal Land Councils in NSW from communities with a population of <5000 and an Aboriginal population of at least 3%. The results were analysed descriptively. Towns and communities with a higher population of Aboriginal people and lower median weekly income were less likely to have access to free refrigerated and filtered water within the community or at local schools compared with towns and communities with a lower Aboriginal population and higher median weekly income. The availability of free, clean and refrigerated water in rural and remote communities is critical to reducing the consumption of sugar-sweetened beverages and the promotion of water as the preferred drink.

The Indigenous Adolescent Oral Health Partnership Study: A Co-Design Study Protocol.

BACKGROUND: in this protocol we outline a method of working alongside Aboriginal communities to learn about and facilitate improvement in the oral health habits in Aboriginal adolescents. By facilitating positive oral health in Aboriginal adolescents, we hope to achieve lifelong improvement in oral health and general wellbeing. METHODS: this paper outlines a co-design methodology through which researchers and Aboriginal communities will work together to create a custom oral healthcare program aimed at Aboriginal adolescents. Researchers, a youth advisory group, Aboriginal community-controlled health services and three regional NSW communities will together devise an oral health strategy focused on five components: application of topical fluoride, increasing water consumption, improving nutrition, daily toothbrushing, and enhancing social and emotional wellbeing. Capacity building is a key outcome of this program. DISCUSSION: as the gap in health status between Aboriginal and non-Aboriginal people remains wide, it is clear that new approaches and attitudes are needed in Aboriginal public health research. This protocol is representative of this shifting approach; giving power to Aboriginal communities who seek to have sovereignty and self-determination over their healthcare. TRIAL REGISTRATION: TRN: ISRCTN15496753 Date of registration: 20 October 2021.

Enablers and Barriers to Accessing Healthcare Services for Aboriginal People in New South Wales, Australia.

BACKGROUND: Australia's healthcare system is complex and fragmented which can create challenges in healthcare, particularly in rural and remote areas. Aboriginal people experience inequalities in healthcare treatment and outcomes. This study aimed to investigate barriers and enablers to accessing healthcare services for Aboriginal people living in regional and remote Australia. METHODS: Semi-structured interviews were conducted with healthcare delivery staff and stakeholders recruited through snowball sampling. Three communities were selected for their high proportion of Aboriginal people and diverse regional and remote locations. Thematic analysis identified barriers and enablers. RESULTS: Thirty-one interviews were conducted in the three communities (n = 5 coastal, n = 13 remote, and n = 13 border) and six themes identified: (1) Improved coordination of healthcare services; (2) Better communication between services and patients; (3) Trust in services and cultural safety; (4) Importance of prioritizing health services by Aboriginal people; (5) Importance of reliable, affordable and sustainable services; (6) Distance and transport availability. These themes were often present as both barriers and enablers to healthcare access for Aboriginal people. They were also present across the healthcare system and within all three communities. CONCLUSIONS: This study describes a pathway to better healthcare outcomes for Aboriginal Australians by providing insights into ways to improve access.

Child Fluoride Varnish Programs Implementation: A Consensus Workshop and Actions to Increase Scale-Up in Australia.

This paper presents the findings of the National Fluoride Varnish Workshop in 2018 along with subsequent actions to scale-up the use of fluoride varnish nationally in Australia. The use of fluoride varnish programs to prevent dental caries in high-risk child populations is an evidence-based population health approach used internationally. Such programs have not been implemented at scale nationally in Australia. A National Fluoride Varnish Consensus Workshop was held in Sydney in November 2018 with an aim of sharing the current work in this area being undertaken by various Australian jurisdictions and seeking consensus on key actions to improve the scale-up nationally. Forty-four people attended the Workshop with oral health representatives from all Australian state and territory health departments, as well as the Australian Dental Association (ADA) at both NSW branch and Federal levels. There was strong support for further scale-up of fluoride varnish programs nationally and to see the wider use of having non-dental professionals apply the varnish. This case study identifies key actions required to ensure scale-up of systematic fluoride varnish programs as part of a strategic population oral health approach to preventing dental caries among high-risk children who may not routinely access dental care.

Costing the Scale-Up of a National Primary School-Based Fluoride Varnish Program for Aboriginal Children Using Dental Assistants in Australia.

There is good evidence that fluoride varnish programs are effective in preventing dental caries in children. This study aims to provide a costing for the scale-up of a child fluoride varnish program in New South Wales (NSW), Australia. Most child fluoride varnish programs are school-based, and a number of studies have examined the acceptability and cost effectiveness of using non-dental providers to apply the fluoride varnish. This paper describes the number of primary schools in Australia that could be targeted using a standard population-based risk criteria based on published data. A costing method was developed for various scenarios of school enrolment and provider types, along with potential revenue from the Child Dental Benefits Schedule (CDBS). Most of the costs of a school-based fluoride varnish program can be covered by the CDBS with assumptions of 80% child consent and 75% CDBS eligibility. While the scale-up of child fluoride varnish programs to prevent dental caries has been recommended by numerous strategic plans and reports, particularly for Aboriginal and Torres Strait Islander children, limited progress has been made. This paper concludes that using a standardized criteria for targeting schools using a combination of ICSEA and Aboriginal enrolments, and aiming at four applications a year, is feasible, and that the main costs of the program could be covered by using the CDBS.

Enabling Aboriginal dental assistants to apply fluoride varnish for school children in communities with a high Aboriginal population in New South Wales, Australia: a study protocol for a feasibility study.

BACKGROUND: Australian Aboriginal children experience high levels of dental caries (tooth decay) and are less likely to access preventive dental health services. High-strength fluoride varnish has been shown to reduce the incidence of dental caries and is commonly used in community-based preventive dental health service programs. In New South Wales, Australia, the application of fluoride varnish is restricted to dental and medical professionals. This is problematic in communities with a high Aboriginal population and limited access to oral health services, contributing to the increased risk of developing dental caries in Aboriginal children. Dental assistants are essential members of the oral health team; however, they do not have a defined scope of practice in Australia. Other countries have created formal scopes of practice for dental assistants to include the application of fluoride varnish. This protocol presents a pathway for qualified Aboriginal dental assistants to undertake additional training to legally apply fluoride varnish in New South Wales. The primary objective of this study will be to evaluate the feasibility and acceptability of utilising Aboriginal dental assistants to apply fluoride varnish to Aboriginal children in a school setting at regular 3-month intervals. METHODS: Six schools across New South Wales (NSW) that enrol at least 12% Aboriginal children will be invited to participate in the 12-month study. Aboriginal children aged 5-12 years enrolled in these schools will be enrolled in the study. Six Aboriginal dental assistants will undertake training to apply fluoride varnish. Fluoride varnish (Duraphat) will be applied at 3-month intervals by the dental assistants to the teeth using a small brush. An evaluation will be undertaken to determine the feasibility and cost-effectiveness of this innovative approach. This study protocol has been approved by the NSW Aboriginal Health and Medical Research Council and the NSW State Education Research Application Process. DISCUSSION: A qualified Aboriginal dental assistant workforce in NSW (or Australia) legally approved to apply fluoride varnish may increase the sustainability and scalability of fluoride varnish programs and improve the oral health of Aboriginal children in Australia. TRIAL REGISTRATION: ISRCTN26746753.