Disseminating information on acute public health events globally: experiences from the WHO's Disease Outbreak News.

WHO works, on a daily basis, with countries globally to detect, prepare for and respond to acute public health events. A vital component of a health response is the dissemination of accurate, reliable and authoritative information. The Disease Outbreak News (DON) reports are a key mechanism through which WHO communicates on acute public health events to the public. The decision to produce a DON report is taken on a case-by-case basis after evaluating key criteria, and the subsequent process of producing a DON report is highly standardised to ensure the robustness of information. DON reports have been published since 1996, and up to 2022 over 3000 reports have been published. Between 2018 and 2022, the most frequently published DON reports relate to Ebola virus disease, Middle East respiratory syndrome, yellow fever, polio and cholera. The DON web page is highly visited with a readership of over 2.6 million visits per year, on average. The DON report structure has evolved over time, from a single paragraph in 1996 to a detailed report with seven sections currently. WHO regularly reviews the DON report process and structure for improvements. In the last 25 years, DON reports have played a unique role in rapidly disseminating information on acute public health events to health actors and the public globally. They have become a key information source for the global public health response to the benefit of individuals and communities.

Epidemiology of dengue reported in the World Health Organization's Western Pacific Region, 2013-2019.

The global burden of dengue, an emerging and re-emerging mosquito-borne disease, increased during the 20-year period ending in 2019, with approximately 70% of cases estimated to have been in Asia. This report describes the epidemiology of dengue in the World Health Organization's Western Pacific Region during 2013-2019 using regional surveillance data reported from indicator-based surveillance systems from countries and areas in the Region, supplemented by publicly available dengue outbreak situation reports. The total reported annual number of dengue cases in the Region increased from 430 023 in 2013 to 1 050 285 in 2019, surpassing 1 million cases for the first time in 2019. The reported case-fatality ratio ranged from 0.19% (724/376 972 in 2014 and 2030/1 050 285 in 2019) to 0.30% (1380/458 843 in 2016). The introduction or reintroduction of serotypes to specific areas caused several outbreaks and rare occurrences of local transmission in places where dengue was not previously reported. This report reinforces the increased importance of dengue surveillance systems in monitoring dengue across the Region.

Tool for tracking all-cause mortality and estimating excess mortality to support the COVID-19 pandemic response.

Problem: Quantifying mortality from coronavirus disease (COVID-19) is difficult, especially in countries with limited resources. Comparing mortality data between countries is also challenging, owing to differences in methods for reporting mortality. Context: Tracking all-cause mortality (ACM) and comparing it with expected ACM from pre-pandemic data can provide an estimate of the overall burden of mortality related to the COVID-19 pandemic and support public health decision-making. This study validated an ACM calculator to estimate excess mortality during the COVID-19 pandemic. Action: The ACM calculator was developed as a tool for computing expected ACM and excess mortality at national and subnational levels. It was developed using R statistical software, was based on a previously described model that used non-parametric negative binomial regression and was piloted in several countries. Goodness-of-fit was validated by forecasting 2019 mortality from 2015-2018 data. Outcome: Three key lessons were identified from piloting the tool: using the calculator to compare reported provisional ACM with expected ACM can avoid potential false conclusions from comparing with historical averages alone; using disaggregated data at the subnational level can detect excess mortality by avoiding dilution of total numbers at the national level; and interpretation of results should consider system-related performance indicators. Discussion: Timely tracking of ACM to estimate excess mortality is important for the response to COVID-19. The calculator can provide countries with a way to analyse and visualize ACM and excess mortality at national and subnational levels.

An epidemiological overview of human infections with HxNy avian influenza in the Western Pacific Region, 2003-2022.

Avian influenza subtype A(HxNy) viruses are zoonotic and may occasionally infect humans through direct or indirect contact, resulting in mild to severe illness and death. Member States in the Western Pacific Region (WPR) communicate and notify the World Health Organization of any human cases of A(HxNy) through the International Health Regulations (IHR 2005) mechanism. This report includes all notifications in the WPR with illness onset dates from 1 November 2003 to 31 July 2022. During this period, there were 1972 human infections with nine different A(HxNy) subtypes notified in the WPR. Since the last report, an additional 134 human avian influenza infections were notified from 1 October 2017 to 31 July 2022. In recent years there has been a change in the primary subtypes and frequency of reports of human A(HxNy) in the region, with a reduction of A(H7N9) and A(H5N1), and conversely an increase of A(H5N6) and A(H9N2). Furthermore, three new subtypes A(H7N4), A(H10N3) and A(H3N8) notified from the People's Republic of China were the first ever recorded globally. The public health risk from known A(HxNy) viruses remains low as there is no evidence of person-to-person transmission. However, the observed changes in A(HxNy) trends reinforce the need for effective and rapid identification to mitigate the threat of a pandemic from avian influenza if person-to-person transmission were to occur.

Emergency response and the need for collective competence in epidemiological teams.

OBJECTIVE: To determine the challenges met by, and needs of, the epidemiology emergency response workforce, with the aim of informing the development of a larger survey, by conducting key informant interviews of public health experts. METHODS: We defined our study population as public health experts with experience of epidemiology deployment. Using purposive sampling techniques, we applied random number sampling to shortlists of potential interviewees provided by key organizations to obtain 10 study participants; we identified three additional interviewees through snowballing. The same interviewer conducted all key informant interviews during May-August 2019. We thematically analysed de-identified transcripts using a qualitative data analysis computer software package. FINDINGS: Despite our interviewees having a wide range of organizational and field experience, common themes emerged. Interviewees reported a lack of clarity in the definition of an emergency response epidemiologist; the need for a broader range of skills; and inadequate leadership and mentoring in the field. Interviewees identified the lack of interpersonal skills (e.g. communication) and a lack of career progression options as limitations to the effectiveness of emergency response. CONCLUSION: The epidemiology emergency response workforce is currently not achieving collective competence. The lack of a clear definition of the role must be addressed, and leadership is required to develop teams in which complementary skills are harmonized and those less experienced can be mentored. Epidemiology bodies must consider individual professional accreditation to ensure that the required skills are being achieved, as well as enabling continual professional development.

Shaping applied epidemiology workforce training to strengthen emergency response: a global survey of applied epidemiologists, 2019-2020.

BACKGROUND: Rapid and effective emergency response to address health security relies on a competent and suitably trained local and international workforce. The COVID-19 pandemic has highlighted that the health security workforce needs to be well equipped to tackle current and future challenges. In this study, we explored whether training in applied epidemiology was meeting the current needs of the applied epidemiology workforce. METHOD: We conducted a cross-sectional online survey that was available in English and French. We used purposive and snowballing sampling techniques to identify potential survey respondents. An online social media advertisement campaign was used to disseminate a REDCap survey link between October 2019 and February 2020 through field epidemiology networks. Survey questions included demographic details of participants, along with their technical background, level of formal education, topics studied during epidemiology training, and years of experience as an epidemiologist. We used Pearson Chi-squared (Chi2) to test the difference between categorical variables, and content analysis to evaluate responses to open-ended questions. RESULTS: In total, 282 people responded to the survey. Participants had a range of formal public health and epidemiology training backgrounds. Respondents applied epidemiology experience spanned almost 30 years, across 64 countries. Overall, 74% (n = 210) were alumni of Field Epidemiology Training Programs (FETP). Basic outbreak and surveillance training was well reported by respondents, however training in specialised techniques related to emergency response, communication, and leadership was less common. FETP graduates reported higher levels of formal training in all survey topics. CONCLUSION: It is critical for the health security workforce to be well-trained and equipped with skills needed to ensure a rapid and effective response to acute public health events. Leadership, communication, interpersonal skills, and specialist training in emergency response are lacking in current training models. Our study has demonstrated that applied epidemiology workforce training must evolve to remain relevant to current and future public health challenges.

Strengthening national, regional and global health capacity through the WHO Western Pacific Region's Field Epidemiology Fellowship Programme.

OBJECTIVE: The World Health Organization's (WHO's) Field Epidemiology Fellowship Programme in the Western Pacific Region aims to strengthen countries' capacities for surveillance and risk assessment and build a workforce to tackle public health emergencies. A survey was conducted to assess the on-the-job training experience of the Regional Fellows, evaluate the strengths of the Programme and gain feedback on areas for improvement. METHODS: Between 25 September and 25 October 2018, an online survey was sent to Regional Fellows who had participated in the Programme between July 2006 and September 2018. The survey was shared with WHO country offices in the Western Pacific Region and directly with graduates of the Programme. Responses were recorded electronically and analysed. RESULTS: A total of 53 former Regional Fellows responded (54% response rate; 53/98). At the time of Programme participation, the Fellows' median age was 35, 62% (33/53) were female and 72% (38/53) were affiliated with a national or subnational health department. Fellows gained experience in event-based surveillance and risk assessment and worked among a diverse group of professionals in various Member States. Altogether, 77% (41/53) of respondents believed that the Programme had helped them move into a better career position with greater responsibility. Ninety-four percent (50/53) would recommend the Programme to their colleagues. DISCUSSION: Alumni from the Western Pacific Region's Field Epidemiology Fellowship Programme perform key health security roles, particularly within governmental systems, and directly contribute to managing health emergencies in their countries, in the Region and globally. The Programme is building a workforce with surge capacity to ensure that public health events in the Region can be addressed. Furthermore, connections developed through the Programme are helping to develop an alumni network, and enhance communications among Member States and between Member States and WHO.

Study protocol: building an evidence base for epidemiology emergency response, a mixed-methods study.

INTRODUCTION: Determinants and drivers for emergencies, such as political instability, weak health systems, climate change and forcibly displaced populations, are increasing the severity, complexity and frequency of public health emergencies. As emergencies become more complex, it is increasingly important that the required skillset of the emergency response workforce is clearly defined. To enable essential epidemiological activities to be implemented and managed during an emergency, a workforce is required with the right mix of skills, knowledge, experience and local context awareness. This study aims to provide local and international responders with an opportunity to actively contribute to the development of new thinking around emergency response roles and required competencies. In this study, we will develop recommendations using a broad range of evidence to address identified lessons and challenges so that future major emergency responses are culturally and contextually appropriate, and less reliant on long-term international deployments. METHOD AND ANALYSIS: We will conduct a mixed-methods study using an exploratory sequential study design. The integration of four data sources, including key informant interviews, a scoping literature review, survey and semistructured interviews will allow the research questions to be examined in a flexible, semistructured way, from a range of perspectives. The study is unequally weighted, with a qualitative emphasis. We will analyse all activities as individual components, and then together in an integrated analysis. Thematic analysis will be conducted in NVivo V.11 and quantitative analysis will be conducted in Stata V.15. ETHICS AND DISSEMINATION: All activities have been approved by the Science and Medical Delegated Ethics Review Committee at the Australian National University (protocol numbers 2018-521, 2018-641, 2019-068). Findings will be disseminated through international and local deployment partners, peer-reviewed publication, presentation at international conferences and through social media such as Twitter and Facebook.

Regional event-based surveillance in WHO's Western Pacific Region.

In the World Health Organization's Western Pacific Region, event-based surveillance has been conducted for more than a decade to rapidly detect and assess public health events. This report describes the establishment and evolution of the Western Pacific Region's event-based surveillance system and presents an analysis of public health events in the Region. Between July 2008 and June 2017, a total of 2396 events were reported in the Western Pacific Region, an average of 266 events per year. Infectious diseases in humans and animals accounted for the largest proportion of events recorded during this period (73%, 1743 events). Maintaining and strengthening this well established system is critical to support the rapid detection, assessment and response to public health events to sustain regional health security.

Chikungunya virus outbreak in Sint Maarten, 2013-2014.

This report describes the outbreak of chikungunya virus (CHIKV) in Sint Maarten, a constituent country of Kingdom of the Netherlands comprising the southern part of the Caribbean island of Saint Martin, from 22 December 2013 (first reported case) through 5 December 2014. The outbreak was first reported by the French overseas collectivity of Saint-Martin in the northern part of the island-the first site in the Americas to report autochthonous transmission of CHIKV. By 5 December 2014, Sint Maarten had reported a total of 658 cases-an overall attack rate of 1.76%. Actual prevalence may have been higher, as some cases may have been misdiagnosed as dengue. Fever and arthralgia affected 71% and 69% of reported cases respectively. Of the 390 laboratory-confirmed cases, 61% were female and the majority were 20-59 years old (mean: 42; range: 4-92). The spread of CHIKV to Sint Maarten was inevitable given the ease of movement of people, and the vector, island-wide. Continuing their history of collaboration, the French and Dutch parts of the island coordinated efforts for prevention and control of the disease. These included a formal agreement to exchange epidemiological information on a regular basis and provide alerts in a timely manner; collaboration among personnel through joint island-wide planning of mosquito control activities, especially along borders; notification of all island visitors, upon their arrival at airports and seaports, of preventative measures to avoid being bitten by mosquitoes; dissemination of educational materials to the public; and island-wide public awareness campaigns, particularly in densely populated areas, for both residents and visitors. The information provided in this report could help increase understanding of the epidemiological characteristics of CHIKV and guide other countries dealing with vector-borne epidemics.

First reported enterovirus D68 infection in pediatric patients from the Caribbean region: evidence of spread from the U.S. outbreak.

The 2014 enterovirus D68 (EV-D68) outbreak in the United States raised concerns about the introduction of the virus in the Caribbean region. The objective of this study was to provide rapid evidence of the introduction of EV-D68 strains in the Caribbean region during the 2014 outbreak in the United States, using a relatively simple phylogenetic approach. From October 2014 to May 2015, four EV-D68 cases from two countries (Bermuda and Dominica) were detected at the regional referral laboratory at the Caribbean Public Health Agency (Port of Spain, Trinidad and Tobago) based on molecular testing of respiratory specimens. All cases were children presenting to hospitals with moderate respiratory distress. No cases of acute flaccid paralysis were detected. Phylogenetic analysis of the Caribbean strains showed more than 99% similarity with the 2014 U.S.-outbreak strain, providing evidence of the introduction and circulation of the virus in the region.

Chikungunya virus outbreak in Sint Maarten, 2013-2014 / Brote de virus del chikungunya en Sint Maarten, 2013-2014

ABSTRACT This report describes the outbreak of chikungunya virus (CHIKV) in Sint Maarten, a constituent country of Kingdom of the Netherlands comprising the southern part of the Caribbean island of Saint Martin, from 22 December 2013 (first reported case) through 5 December 2014. The outbreak was first reported by the French overseas collectivity of Saint-Martin in the northern part of the island—the first site in the Americas to report autochthonous transmission of CHIKV. By 5 December 2014, Sint Maarten had reported a total of 658 cases—an overall attack rate of 1.76%. Actual prevalence may have been higher, as some cases may have been misdiagnosed as dengue. Fever and arthralgia affected 71% and 69% of reported cases respectively. Of the 390 laboratory-confirmed cases, 61% were female and the majority were 20-59 years old (mean: 42; range: 4-92). The spread of CHIKV to Sint Maarten was inevitable given the ease of movement of people, and the vector, island-wide. Continuing their history of collaboration, the French and Dutch parts of the island coordinated efforts for prevention and control of the disease. These included a formal agreement to exchange epidemiological information on a regular basis and provide alerts in a timely manner; collaboration among personnel through joint island-wide planning of mosquito control activities, especially along borders; notification of all island visitors, upon their arrival at airports and seaports, of preventative measures to avoid being bitten by mosquitoes; dissemination of educational materials to the public; and island-wide public awareness campaigns, particularly in densely populated areas, for both residents and visitors. The information provided in this report could help increase understanding of the epidemiological characteristics of CHIKV and guide other countries dealing with vector-borne epidemics.(AU)

RESUMEN En el presente artículo se describe el brote del virus del chikungunya (CHIKV) que tuvo lugar entre el 22 de diciembre del 2013 (primer caso notificado) y el 5 de diciembre del 2014 en Sint Maarten, uno de los países integrantes del Reino de los Países Bajos, que comprende la parte sur de la isla caribeña de San Martín. El brote fue notificado primero por la colectividad de ultramar francesa de Saint-Martin, que ocupa la parte norte de la isla, convirtiéndose en la primera zona de las Américas en describir la transmisión autóctona del CHIKV. El 5 de diciembre del 2014, Sint Maarten había notificado 658 casos, equivalentes a una tasa de ataque del 1,76%, si bien la prevalencia real quizá haya sido mayor, puesto que algunos casos pueden haberse confundido por dengue. El 71% y el 69% de los casos notificados cursaron con fiebre y artralgias, respectivamente. De los 390 casos confirmados por laboratorio, el 61% eran mujeres y la mayoría tenían entre 20 y 59 años de edad (media: 42; intervalo: 4-92). Era inevitable que el CHIKV pasara a Sint Maarten, dadas la facilidad de movimiento de las personas y la extensión del vector por toda la isla. Siguiendo la tradición de cooperación mutua, las partes francesa y holandesa de la isla coordinaron las actuaciones de prevención y control, que consistieron en: la formalización de un convenio para intercambiar datos epidemiológicos de forma regular y emitir alertas puntualmente; la colaboración del personal de uno y otro lado para planificar, en todo el territorio insular, las actividades de control de mosquitos, sobre todo a lo largo de las fronteras; la notificación a todos los viajeros en arribo, a su llegada a los puertos y aeropuertos, de las medidas preventivas para evitar la picadura de los mosquitos; la difusión de materiales didácticos; y la realización de campañas públicas de concientización por toda la isla, en particular en las áreas de mayor densidad demográfica, dirigidas tanto a residentes como a turistas. La información expuesta en este informe puede ayudar a conocer mejor las características epidemiológicas del CHIKV y servir de orientación para otros países que hagan frente a epidemias transmitidas por vectores.(AU)

First reported enterovirus D68 infection in pediatric patients from the Caribbean region: evidence of spread from the U.S. outbreak / Primeros casos notificados en el Caribe de infección por enterovirus D68 en pacientes pediátricos: pruebas de la propagación del brote de los Estados Unidos

ABSTRACT The 2014 enterovirus D68 (EV-D68) outbreak in the United States raised concerns about the introduction of the virus in the Caribbean region. The objective of this study was to provide rapid evidence of the introduction of EV-D68 strains in the Caribbean region during the 2014 outbreak in the United States, using a relatively simple phylogenetic approach. From October 2014 to May 2015, four EV-D68 cases from two countries (Bermuda and Dominica) were detected at the regional referral laboratory at the Caribbean Public Health Agency (Port of Spain, Trinidad and Tobago) based on molecular testing of respiratory specimens. All cases were children presenting to hospitals with moderate respiratory distress. No cases of acute flaccid paralysis were detected. Phylogenetic analysis of the Caribbean strains showed more than 99% similarity with the 2014 U.S.-outbreak strain, providing evidence of the introduction and circulation of the virus in the region.(AU)

RESUMEN El brote de enterovirus D68 (EV-D68) registrado en el 2014 en los Estados Unidos suscitó preocupación acerca de la introducción del virus en el Caribe. El objetivo de este estudio fue aportar pruebas rápidas, mediante la adopción de un enfoque filogénico relativamente sencillo, de que durante ese brote ingresaron en el Caribe cepas del EV-D68. Entre octubre del 2014 y mayo del 2015, el laboratorio regional de referencia ubicado en el Organismo de Salud Pública del Caribe (Puerto España, Trinidad y Tabago) detectó cuatro casos de EV-D68 provenientes de dos países (Bermudas y Dominica) mediante el análisis molecular de muestras respiratorias. Todos los casos correspondían a niños que acudieron al hospital con dificultad respiratoria moderada. No se detectó ningún caso de parálisis flácida aguda. El análisis filogénico de las cepas encontradas en el Caribe demostró una semejanza superior al 99 % con la cepa responsable del brote del 2014 en los Estados Unidos, lo que demuestra la introducción y la circulación del virus en la región.(AU)

Regionalization as an approach to regulatory systems strengthening: a case study in CARICOM member states.

Improving basic capacities for regulation of medicines and health technologies through regulatory systems strengthening is particularly challenging in resource-constrained settings. "Regionalization"-an approach in which countries with common histories, cultural values, languages, and economic conditions work together to establish more efficient systems-may be one answer. This report describes the Caribbean Regulatory System (CRS), a regionalization initiative being implemented in the mostly small countries of the Caribbean Community and Common Market (CARICOM). This initiative is an innovative effort to strengthen regulatory systems in the Caribbean, where capacity is limited compared to other subregions of the Americas. The initiative's concept and design includes a number of features and steps intended to enhance sustainability in resource-constrained contexts. The latter include 1) leveraging existing platforms for centralized cooperation, governance, and infrastructure; 2) strengthening regulatory capacities with the largest potential public health impact; 3) incorporating policies that promote reliance on reference authorities; 4) changing the system to encourage industry to market their products in CARICOM (e.g., using a centralized portal of entry to reduce regulatory burdens); and 5) building human resource capacity. If implemented properly, the CRS will be self-sustaining through user fees. The experience and lessons learned thus far in implementing this initiative, described in this report, can serve as a case study for the development of similar regulatory strengthening initiatives in resource-constrained environments.

An outbreak of influenza A(H1N1)pdm09 virus in a primary school in Vietnam.

BACKGROUND: Despite school pupils being at greatest risk during the 2009 influenza pandemic there are limited data on outbreaks of influenza A(H1N1)pdm09 in primary schools in South-East Asia. This prospective cohort study describes an outbreak of influenza A(H1N1)pdm09 in a primary school in rural Vietnam. FINDINGS: In total 103 cases of influenza-like illness were found among the 407 pupils in the primary school. Ten of these were laboratory confirmed cases of influenza A(H1N1)pdm09 virus. The overall attack rate (AR) was 25% (103/407), and was highest (41%) in grade 4 pupils, where the outbreak started. All cases in the outbreak presented with a mild and self-limiting illness, acute respiratory symptoms and fever. Public health interventions to contain the outbreak could explain the lower attack rates in other grades. Ill pupils were asked to stay at home. Oseltamivir was not given to pupils and the school did not close during the outbreak. The last detected case occurred 12 days following identification of the first case. CONCLUSIONS: This is the first report of an outbreak of influenza A(H1N1)pdm09 among pupils in a primary school in Vietnam. High attack rates in Grade 4 pupils suggest shared activities contributed to transmission. The public health response using non-pharmaceutical measures may have played a role in ending the outbreak.

Knowledge, attitudes, experience and behaviour of frontline health care workers during the early phase of 2009 influenza A(H1N1) pandemic, Birmingham, UK.

OBJECTIVES: During the early ('containment') phase of the influenza A(H1N1) pandemic, when the severity of the pandemic was unclear, health care workers (HCWs) across the UK were deployed to swab and prescribe antiviral drugs to suspected cases. This study describes the knowledge, attitudes, experience and behaviour of frontline HCWs in Birmingham, West Midlands, during this period. METHODS: During June 2009, a 25-item semi-structured questionnaire was used to survey HCWs who undertook defined clinical duties as part of the public health response during the early phase of the pandemic. Participants were clinical staff based in a primary care out-of-hours service provider. RESULTS: The response rate was 50% (n = 20). All respondents provided direct clinical care that necessitated prolonged close contact with potentially infectious cases. Knowledge and use of personal protective equipment and infection control procedures was consistently high. However, the main source of infection control advice was local guidance. Uptake of, and attitude towards, vaccination as a preventive measure and antiviral prophylaxis was poor. CONCLUSIONS: HCWs were prepared to provide an essential health care response during the pandemic even when the severity of disease was unclear. However, more needs to be done to change health care workers' negative attitudes towards taking antivirals and receiving influenza vaccination.

Prioritization of zoonotic diseases of public health significance in Vietnam.

INTRODUCTION: Prioritization of zoonotic diseases is critical as it facilitates optimization of resources, greater understanding of zoonotic diseases and implementation of policies promoting multisectoral collaboration. This study aimed to establish strategic priorities for zoonotic diseases in Vietnam taking a key stakeholder approach. METHODOLOGY: Two weeks prior to a workshop on zoonotic diseases a questionnaire was developed and posted to key professionals involved in different areas of zoonotic disease management in Vietnam. Respondents were asked to assess the relative priority of 12 zoonotic diseases using a number of evidence-based criteria, and to provide suggestions to strengthen multisectoral collaboration. RESULTS: A response rate of 69% (51/74) was obtained, and 75% (38/51) respondents worked in non-international Vietnamese organizations. Respondents identified the top five diseases for prioritization in Vietnam as: avian influenza, rabies, Streptococcus suis infection, pandemic influenza and foodborne bacterial diseases. The three criteria most used to rank diseases were severity of disease, outbreak potential and public attention. Avian influenza was ranked as the number one priority zoonotic disease in Vietnam by 57% of the respondents, followed by rabies (18%). Respondents identified coordination mechanisms, information sharing and capacity building as the most important areas for strengthening to enhance multisectoral collaboration. CONCLUSIONS: This study is the first systematic and broad-based attempt to prioritize zoonotic diseases of public health significance in Vietnam using key stakeholders, and a comparative and transparent method. There is limited literature for policy makers and planners on this topic and the results of this study can be used to guide decision-making.