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2.
BMJ Glob Health ; 5(8)2020 08.
Artículo en Inglés | MEDLINE | ID: mdl-32859647

RESUMEN

INTRODUCTION: People's confidence in and endorsement of the health system are key measures of system performance, yet are undermeasured in low-income and middle-income countries (LMICs). We explored the prevalence and predictors of these measures in 12 countries. METHODS: We conducted an internet survey in Argentina, China, Ghana, India, Indonesia, Kenya, Lebanon, Mexico, Morocco, Nigeria, Senegal and South Africa collecting demographics, ratings of quality, and confidence in and endorsement of the health system. We used multivariable logistic regression to assess the association between confidence/endorsement and self-reported quality of recent healthcare. RESULTS: Of 13 489 respondents, 62% reported a health visit in the past year. Applying population weights, 32% of these users were very confident that they could receive effective care if they were to 'become very sick tomorrow'; 30% endorsed the health system, that is, agreed that it 'works pretty well and only needs minor changes'. Reporting high quality in the last visit was associated with 4.48 and 2.69 greater odds of confidence (95% CI 3.64 to 5.52) and endorsement (95% CI 2.33 to 3.11). Having health insurance was positively associated with confidence and endorsement (adjusted odds ratio (AOR) 1.68, 95% CI 1.49 to 1.90 and AOR 1.34, 95% CI 1.22 to 1.48), while experiencing discrimination in healthcare was negatively associated (AOR 0.67, 95% CI 0.56 to 0.80 and AOR 0.63, 95% CI 0.53 to 0.76). CONCLUSION: Confidence and endorsement of the health system were low across 12 LMICs. This may hinder efforts to gain support for universal health coverage. Positive patient experience was strongly associated with confidence in and endorsement of the health system.


Asunto(s)
Países en Desarrollo , Internet , China , Ghana , Humanos , India , Kenia , México , Nigeria , Senegal , Sudáfrica
3.
Vaccine ; 38(28): 4355-4361, 2020 06 09.
Artículo en Inglés | MEDLINE | ID: mdl-32418791

RESUMEN

New strategies will be critical to reduce infant mortality and severe morbidity - there are still 5.2 million newborn deaths and stillbirths each year. The decline in newborn mortality has not kept pace with the reduction in under-five deaths and is slowest in low- and lower-middle-income countries (LMICs). Maternal immunization is a promising intervention to protect infants when they are most vulnerable - in utero and their first few months of life, before they can receive their own vaccines. Successfully introducing new vaccines for pregnant women in LMICs will require collaboration between two fields - (1) immunization and (2) maternal, newborn and child health - that use different service delivery approaches, operate under different policy and funding paradigms, and are not always integrated. In May 2018, stakeholders from these distinct communities convened to identify challenges and opportunities associated with delivering new maternal immunizations. Participants agreed that antenatal care is a logical platform. However, in many resource-constrained settings, antenatal care providers are already overburdened, and most women do not receive the recommended number of antenatal visits. Implementing maternal immunization could help increase antenatal care attendance by offering an additional safe and effective intervention that women value. Substantial effort is needed to demonstrate the benefits of maternal immunization to decision-makers and providers, and to ensure that countries and health systems are ready for introduction. To that end, participants identified the following priorities: assure coherence of policies for introducing new vaccines for pregnant women and strengthen maternal health interventions; generate demand for existing, recommended, and new maternal vaccines; conduct socio-behavioral, health systems and implementation research to shape optimal vaccine delivery strategies; and strengthen antenatal and perinatal care quality. To achieve these aims, collaboration across fields will be essential. Given that new maternal vaccines are advancing in clinical development, time is of the essence.


Asunto(s)
Países en Desarrollo , Vacunas , Niño , Femenino , Humanos , Inmunización , Lactante , Recién Nacido , Embarazo , Atención Prenatal , Vacunación
4.
Int J Gynaecol Obstet ; 148(3): 290-299, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31709527

RESUMEN

OBJECTIVE: To systematically develop evidence-based bundles for care of postpartum hemorrhage (PPH). METHODS: An international technical consultation was conducted in 2017 to develop draft bundles of clinical interventions for PPH taken from the WHO's 2012 and 2017 PPH recommendations and based on the validated "GRADE Evidence-to-Decision" framework. Twenty-three global maternal-health experts participated in the development process, which was informed by a systematic literature search on bundle definitions, designs, and implementation experiences. Over a 6-month period, the expert panel met online and via teleconferences, culminating in a 2-day in-person meeting. RESULTS: The consultation led to the definition of two care bundles for facility implementation. The "first response to PPH bundle" comprises uterotonics, isotonic crystalloids, tranexamic acid, and uterine massage. The "response to refractory PPH bundle" comprises compressive measures (aortic or bimanual uterine compression), the non-pneumatic antishock garment, and intrauterine balloon tamponade (IBT). Advocacy, training, teamwork, communication, and use of best clinical practices were defined as PPH bundle supporting elements. CONCLUSION: For the first response bundle, further research should assess its feasibility, acceptability, and effectiveness; and identify optimal implementation strategies. For the response to refractory bundle, further research should address pending controversies, including the operational definition of refractory PPH and effectiveness of IBT devices.


Asunto(s)
Paquetes de Atención al Paciente/métodos , Hemorragia Posparto/terapia , Femenino , Adhesión a Directriz , Humanos , Cooperación Internacional , Embarazo , Organización Mundial de la Salud
5.
BMJ Glob Health ; 4(5): e001605, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31565407

RESUMEN

INTRODUCTION: Sierra Leone has the world's highest maternal mortality, partly due to low access to caesarean section. Limited data are available to guide improvement. In this study, we aimed to analyse the rate and mortality of caesarean sections in the country. METHODS: We conducted a retrospective study of all caesarean sections and all reported in-facility maternal deaths in Sierra Leone in 2016. All facilities performing caesarean sections were visited. Data on in-facility maternal deaths were retrieved from the Maternal Death Surveillance and Response database. Caesarean section mortality was defined as in-facility perioperative mortality. RESULTS: In 2016, there were 7357 caesarean sections in Sierra Leone. This yields a population rate of 2.9% of all live births, a 35% increase from 2012, with district rates ranging from 0.4% to 5.2%. The most common indications for surgery were obstructed labour (42%), hypertensive disorders (25%) and haemorrhage (22%). Ninety-nine deaths occurred during or after caesarean section, and the in-facility perioperative caesarean section mortality rate was 1.5% (median 0.7%, IQR 0-2.2). Haemorrhage was the leading cause of death (73%), and of those who died during or after surgery, 80% had general anaesthesia, 75% received blood transfusion and 22% had a uterine rupture diagnosed. CONCLUSIONS: The caesarean section rate has increased rapidly in Sierra Leone, but the distribution remains uneven. Caesarean section mortality is high, but there is wide variation. More access to caesarean sections for maternal and neonatal complications is needed in underserved areas, and expansion should be coupled with efforts to limit late presentation, to offer assisted vaginal delivery when indicated and to ensure optimal perioperative care.

6.
PLoS Med ; 16(8): e1002879, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-31390364

RESUMEN

BACKGROUND: High satisfaction with healthcare is common in low- and middle-income countries (LMICs), despite widespread quality deficits. This may be due to low expectations because people lack knowledge about what constitutes good quality or are resigned about the quality of available services. METHODS AND FINDINGS: We fielded an internet survey in Argentina, China, Ghana, India, Indonesia, Kenya, Lebanon, Mexico, Morocco, Nigeria, Senegal, and South Africa in 2017 (N = 17,996). It included vignettes describing poor-quality services-inadequate technical or interpersonal care-for 2 conditions. After applying population weights, most of our respondents lived in urban areas (59%), had finished primary school (55%), and were under the age of 50 (75%). Just over half were men (51%), and the vast majority reported that they were in good health (73%). Over half (53%) of our study population rated the quality of vignettes describing poor-quality services as good or better. We used multilevel logistic regression and found that good ratings were associated with less education (no formal schooling versus university education; adjusted odds ratio [AOR] 2.22, 95% CI 1.90-2.59, P < 0.001), better self-reported health (excellent versus poor health; AOR 5.19, 95% CI 4.33-6.21, P < 0.001), history of discrimination in healthcare (AOR 1.47, 95% CI 1.36-1.57, P < 0.001), and male gender (AOR 1.32, 95% CI 1.23-1.41, P < 0.001). The survey did not reach nonusers of the internet thus only representing the internet-using population. CONCLUSIONS: Majorities of the internet-using public in 12 LMICs have low expectations of healthcare quality as evidenced by high ratings given to poor-quality care. Low expectations of health services likely dampen demand for quality, reduce pressure on systems to deliver quality care, and inflate satisfaction ratings. Policies and interventions to raise people's expectations of the quality of healthcare they receive should be considered in health system quality reforms.


Asunto(s)
Países en Desarrollo/estadística & datos numéricos , Satisfacción del Paciente/estadística & datos numéricos , Calidad de la Atención de Salud/estadística & datos numéricos , Adolescente , Adulto , Estudios Transversales , Femenino , Humanos , Internet/estadística & datos numéricos , Masculino , Persona de Mediana Edad , Encuestas y Cuestionarios , Adulto Joven
7.
Lancet Glob Health ; 7(5): e655-e663, 2019 05.
Artículo en Inglés | MEDLINE | ID: mdl-30910531

RESUMEN

BACKGROUND: Despite international recommendations, coverage of syphilis testing in pregnant women and treatment of those found seropositive remains limited in sub-Saharan Africa. We assessed whether combining the provision of supplies with a behavioural intervention was more effective than providing supplies only, to improve syphilis screening and treatment during antenatal care. METHODS: In this 18-month, cluster randomised controlled trial, we randomly assigned (1:1) 26 urban antenatal care clinics in Kinshasa, Democratic Republic of the Congo, and Lusaka, Zambia, to receive a behavioural intervention (opinion leader selection, academic detailing visits, reminders, audits and feedback, and supportive supervision) plus supplies for syphilis testing and treatment (intervention group) or to receive supplies only (control group). The primary outcomes were proportion of pregnant women who had syphilis screening out of the total who attended the clinic; and the proportion of women who had treatment with benzathine benzylpenicillin out of those who tested positive for syphilis at their first antenatal care visit. This trial is registered at ClinicalTrials.gov, number NCT02353117. FINDINGS: The 18-month study period was Feb 1, 2016, to July 14, 2017. 18 357 women were enrolled at the 13 intervention clinics and 17 679 women were enrolled at the 13 control clinics at their first antenatal care visit. Syphilis screening was done in a median of 99·9% (IQR 99·0-100·0) of women in the intervention clinics and 93·8% (85·0-98·9) in the control clinics (absolute difference 6·1% [95% CI 1·1-14·1]; p=0·00092). Syphilis treatment at the first visit was done in a median of 100% (IQR 99·7-100·0) of seropositive women in intervention clinics and 43·2% (2·6-83·2) of seropositive women in control clinics (absolute difference 56·8% [12·8-99·0]; p=0·0028). INTERPRETATION: A behavioural intervention, together with the provision of supplies, can lead to more than 95% of women being screened and treated for syphilis. The sole provision of supplies is sufficient to reach such levels of screening coverage but is not sufficient to ensure high levels of treatment. FUNDING: Bill & Melinda Gates Foundation.


Asunto(s)
Tamizaje Masivo/métodos , Complicaciones Infecciosas del Embarazo/prevención & control , Atención Prenatal/métodos , Mejoramiento de la Calidad , Sífilis/prevención & control , Adolescente , Antibacterianos/uso terapéutico , Niño , República Democrática del Congo , Femenino , Humanos , Penicilina G Benzatina/uso terapéutico , Embarazo , Complicaciones Infecciosas del Embarazo/tratamiento farmacológico , Mejoramiento de la Calidad/organización & administración , Sífilis/tratamiento farmacológico , Adulto Joven , Zambia
9.
PLoS Med ; 15(1): e1002492, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-29338000

RESUMEN

BACKGROUND: Escalation in the global rates of labour interventions, particularly cesarean section and oxytocin augmentation, has renewed interest in a better understanding of natural labour progression. Methodological advancements in statistical and computational techniques addressing the limitations of pioneer studies have led to novel findings and triggered a re-evaluation of current labour practices. As part of the World Health Organization's Better Outcomes in Labour Difficulty (BOLD) project, which aimed to develop a new labour monitoring-to-action tool, we examined the patterns of labour progression as depicted by cervical dilatation over time in a cohort of women in Nigeria and Uganda who gave birth vaginally following a spontaneous labour onset. METHODS AND FINDINGS: This was a prospective, multicentre, cohort study of 5,606 women with singleton, vertex, term gestation who presented at ≤ 6 cm of cervical dilatation following a spontaneous labour onset that resulted in a vaginal birth with no adverse birth outcomes in 13 hospitals across Nigeria and Uganda. We independently applied survival analysis and multistate Markov models to estimate the duration of labour centimetre by centimetre until 10 cm and the cumulative duration of labour from the cervical dilatation at admission through 10 cm. Multistate Markov and nonlinear mixed models were separately used to construct average labour curves. All analyses were conducted according to three parity groups: parity = 0 (n = 2,166), parity = 1 (n = 1,488), and parity = 2+ (n = 1,952). We performed sensitivity analyses to assess the impact of oxytocin augmentation on labour progression by re-examining the progression patterns after excluding women with augmented labours. Labour was augmented with oxytocin in 40% of nulliparous and 28% of multiparous women. The median time to advance by 1 cm exceeded 1 hour until 5 cm was reached in both nulliparous and multiparous women. Based on a 95th percentile threshold, nulliparous women may take up to 7 hours to progress from 4 to 5 cm and over 3 hours to progress from 5 to 6 cm. Median cumulative duration of labour indicates that nulliparous women admitted at 4 cm, 5 cm, and 6 cm reached 10 cm within an expected time frame if the dilatation rate was ≥ 1 cm/hour, but their corresponding 95th percentiles show that labour could last up to 14, 11, and 9 hours, respectively. Substantial differences exist between actual plots of labour progression of individual women and the 'average labour curves' derived from study population-level data. Exclusion of women with augmented labours from the study population resulted in slightly faster labour progression patterns. CONCLUSIONS: Cervical dilatation during labour in the slowest-yet-normal women can progress more slowly than the widely accepted benchmark of 1 cm/hour, irrespective of parity. Interventions to expedite labour to conform to a cervical dilatation threshold of 1 cm/hour may be inappropriate, especially when applied before 5 cm in nulliparous and multiparous women. Averaged labour curves may not truly reflect the variability associated with labour progression, and their use for decision-making in labour management should be de-emphasized.


Asunto(s)
Trabajo de Parto/fisiología , Adulto , Femenino , Humanos , Primer Periodo del Trabajo de Parto/fisiología , Nigeria , Embarazo , Estudios Prospectivos , Uganda , Adulto Joven
13.
Int J Gynaecol Obstet ; 129(2): 178-83, 2015 May.
Artículo en Inglés | MEDLINE | ID: mdl-25593108

RESUMEN

OBJECTIVE: To demonstrate the feasibility of implementing evidence-based continuing medical education (CME) to improve key skills among maternity staff in Cambodia. METHODS: A skills-based CME program was implemented in 33 Cambodian hospitals. Each clinical skills practice (CSP) module consisted of a 1-day practice session, focusing on three maternal and newborn interventions, followed by support visits to participating hospitals. Skills were assessed at 27 intervention hospitals and five control hospitals 7-11 months after the practice sessions through observation of neonatal resuscitation, magnesium sulfate dilution, and aortic compression simulations. RESULTS: A total of 559 healthcare workers attended at least one CSP practice session. The skills assessment included 47 doctors and 210 midwives. Hospital staff who participated in CSP performed significantly better than did those from control hospitals on neonatal resuscitation (mean score 31.22 vs 17.00; P<0.001), magnesium sulfate dilution (mean score 11.01 vs 8.47; P<0.001), and aortic compression (mean score 13.87 vs 4.33; P<0.001). CSP participants were also significantly more likely to score higher than the 70% cutoff for neonatal resuscitation and magnesium sulfate dilution than were those from control hospitals, after adjustment for hospital level and profession (P≤0.05). CONCLUSION: Key clinical skills in low-resource settings can be improved by implementing CME using simulations and supportive follow-up.


Asunto(s)
Educación Médica Continua/métodos , Capacitación en Servicio/métodos , Cuerpo Médico de Hospitales/educación , Partería/educación , Cambodia , Competencia Clínica/estadística & datos numéricos , Femenino , Humanos , Recién Nacido , Salud Materna , Servicio de Ginecología y Obstetricia en Hospital/organización & administración , Embarazo , Resucitación/educación
14.
Lancet ; 384(9949): 1215-25, 2014 Sep 27.
Artículo en Inglés | MEDLINE | ID: mdl-24965819

RESUMEN

This paper complements the other papers in the Lancet Series on midwifery by documenting the experience of low-income and middle-income countries that deployed midwives as one of the core constituents of their strategy to improve maternal and newborn health. It examines the constellation of various diverse health-system strengthening interventions deployed by Burkina Faso, Cambodia, Indonesia, and Morocco, among which the scaling up of the pre-service education of midwives was only one element. Efforts in health system strengthening in these countries have been characterised by: expansion of the network of health facilities with increased uptake of facility birthing, scaling up of the production of midwives, reduction of financial barriers, and late attention for improving the quality of care. Overmedicalisation and respectful woman-centred care have received little or no attention.


Asunto(s)
Países en Desarrollo , Servicios de Salud Materna/organización & administración , Partería/organización & administración , Atención a la Salud/organización & administración , Femenino , Instituciones de Salud/provisión & distribución , Política de Salud , Humanos , Servicios de Salud Materna/normas , Servicios de Salud Materna/provisión & distribución , Mortalidad Materna , Partería/normas , Aceptación de la Atención de Salud/estadística & datos numéricos , Embarazo , Atención Prenatal/organización & administración , Atención Prenatal/normas , Calidad de la Atención de Salud
16.
Reprod Health Matters ; 20(39): 62-72, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22789083

RESUMEN

Maternal mortality has been falling significantly in Cambodia since 2005 though it had been stagnant for at least 15 years before that. This paper analyzes the evolution of some major societal and health system factors based on recent national and international reports. The maternal mortality ratio fell from 472 per 100,000 live births in 2000-2005 to 206 in 2006-2010. Background factors have included peace and stability, economic growth and poverty reduction, improved primary education, especially for girls, improved roads, improved access to information on health and health services via TV, radio and cellphones, and increased ability to communicate with and within the health system. Specific health system improvements include a rapid increase in facility-based births and skilled birth attendance, notably investment in midwifery training and numbers of midwives providing antenatal care and deliveries within an expanding primary health care network, a monetary incentive for facility-based midwives for every live birth conducted, and an expanding system of health equity funds, making health care free of cost for poor people. Several major challenges remain, including post-partum care, family planning, prevention and treatment of breast and cervical cancer, and addressing sexual violence against women, which need the same priority attention as maternity care.


Asunto(s)
Accesibilidad a los Servicios de Salud/organización & administración , Servicios de Salud Materna/organización & administración , Mortalidad Materna/tendencias , Administración en Salud Pública/estadística & datos numéricos , Aborto Legal , Cambodia/epidemiología , Cesárea/estadística & datos numéricos , Comunicación , Servicios Médicos de Urgencia/organización & administración , Servicios de Planificación Familiar/organización & administración , Femenino , Conocimientos, Actitudes y Práctica en Salud , Humanos , Partería/educación , Partería/organización & administración , Embarazo , Factores Socioeconómicos , Salud de la Mujer
18.
Scand J Public Health ; 38(6): 670-1, 2010 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-20529965

RESUMEN

The issue of strengthening local research capacity in Africa is again high on the health and development agenda. The latest initiative comes from the Wellcome Trust. But when it comes to capacity development, one of the chief obstacles that health sectors in the region must confront is the migration of health professionals to countries that offer more lucrative opportunities, like those in western Europe. To combat this ''brain drain'', already back in 1984, the Swedish International Development Cooperation Agency (Sida) created a training programme in which healthcare professionals from Africa conducted the bulk of their research in their own countries. However, the model was only partly successful. Several years ago, we assessed the preconditions for the renewal of Sida support for research and research training activities in the region. Based on our work to develop a critical mass of beneficial research capacity in the countries of sub-Saharan Africa, this article suggests several recommendations to both donors and governments that have broad application for general health research issues in the region.


Asunto(s)
Salud Pública , Apoyo a la Investigación como Asunto , Investigación/organización & administración , África del Sur del Sahara , Emigración e Inmigración , Humanos , Cooperación Internacional , Medicina Reproductiva
19.
Croat Med J ; 51(1): 74-84, 2010 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-20162748

RESUMEN

AIM: To examine the effectiveness of interventions seeking to prevent the spread of sexually transmitted infections (STIs), including HIV, among young people in the European Union. METHODS: For this systematic review, we examined interventions that aimed at STI risk reduction and health promotion conducted in schools, clinics, and in the community for reported effectiveness (in changing sexual behavior and/or knowledge) between 1995 and 2005. We also reviewed study design and intervention methodology to discover how these factors affected the results, and we compiled a list of characteristics associated with successful and unsuccessful programs. Studies were eligible if they employed a randomized control design or intervention-only design that examined change over time and measured behavioral, biologic, or certain psychosocial outcomes. RESULTS: Of the 19 studies that satisfied our review criteria, 11 reported improvements in the sexual health knowledge and/or attitudes of young people. Ten of the 19 studies aimed to change sexual risk behavior and 3 studies reported a significant reduction in a specific aspect of sexual risk behavior. Two of the interventions that led to behavioral change were peer-led and the other was teacher-led. Only 1 of the 8 randomized controlled trials reported any statistically significant change in sexual behavior, and then only for young females. CONCLUSION: The young people studied were more accepting of peer-led than teacher-led interventions. Peer-led interventions were also more successful in improving sexual knowledge, though there was no clear difference in their effectiveness in changing behavior. The improvement in sexual health knowledge does not necessarily lead to behavioral change. While knowledge may help improve health-seeking behavior, additional interventions are needed to reduce STIs among young people.


Asunto(s)
Infecciones por VIH/prevención & control , Promoción de la Salud/métodos , Enfermedades Bacterianas de Transmisión Sexual/prevención & control , Adolescente , Adulto , Europa (Continente) , Femenino , Infecciones por VIH/transmisión , Humanos , Masculino , Enfermedades Bacterianas de Transmisión Sexual/transmisión , Adulto Joven
20.
Acta Obstet Gynecol Scand ; 89(3): 335-42, 2010 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-20078393

RESUMEN

OBJECTIVE: To determine whether lack of routine antenatal care (ANC) is associated with near-miss morbidity upon arrival at hospital. DESIGN: Case-referent study. SETTING: Four maternity hospitals in La Paz and El Alto, Bolivia, where free maternal health care is provided through a government subsidized program. SAMPLE: Women with severe maternal morbidity upon arrival at hospital (n = 297). Facility-matched referents with an uncomplicated childbirth at hospital (n = 297). METHODS: Prospective inclusion of participants over a period of six months, using clinical and management-based criteria for near-miss. Multivariate logistic regression. MAIN OUTCOME MEASURES: Odds ratios (ORs) with 95% confidence intervals (CIs). Individual and joint effects of interacting variables. RESULTS: Lack of ANC, lower education levels, and rural residence were interactively associated with near-miss upon arrival. Lack of ANC among women with limited education resulted in a four-fold greater risk for this condition. Such risk was considerably increased for women who lived in rural areas (OR 12.6; 95% CI 2.8-56.6). In addition, high maternal age and first time pregnancy were associated with near-miss upon arrival. CONCLUSIONS: This study identified subpopulations most likely to benefit from interventions designed to enable timely care-seeking for obstetric complications. ANC appears to facilitate utilization of emergency obstetric care, especially for women with socio-demographic disadvantages. Targeted initiatives to increase routine ANC may reduce severe maternal morbidity and mortality, both in urban and rural areas.


Asunto(s)
Tratamiento de Urgencia/estadística & datos numéricos , Servicios de Salud Materna/estadística & datos numéricos , Complicaciones del Embarazo/epidemiología , Atención Prenatal/estadística & datos numéricos , Adulto , Bolivia/epidemiología , Estudios de Casos y Controles , Femenino , Humanos , Modelos Logísticos , Embarazo , Resultado del Embarazo , Estudios Prospectivos , Factores de Riesgo , Factores Socioeconómicos , Estadísticas no Paramétricas
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