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1.
Am J Perinatol ; 2023 Jun 06.
Artículo en Inglés | MEDLINE | ID: mdl-37279788

RESUMEN

Based on years of review and analysis of severe maternal morbidity and maternal mortality cases, it is clear that the high rates of maternal mortality in this country are due to more than obstetrical emergencies gone awry. Many nonmedical factors contribute to these poor outcomes including complex and ineffectual health care systems, poor coordination of care, and structural racism. In this article we discuss what physicians can and cannot accomplish on their own, the role of race and racism, and barriers built into the manner in which health care is delivered. We conclude that while obstetricians must continue to focus on the area where their expertise lies, reducing deaths by educating and training physicians to deal with the downstream consequences of upstream events, they must also focus increased attention on educating themselves and their trainees about the effect of racism, social disadvantage, and poor coordination of care on health, as well as their role in resolving these issues. Physicians must also reach out to their representatives in government to partner with them. Those leaders must recognize that when they hear about disparities in maternal mortality, focusing only on events in hospitals ignores the more dispositive issues that put Black women at risk in the first instance. KEY POINTS: · Structural racism contributes to maternal deaths.. · Coordination of postpartum care is critically important.. · U.S. health care system is complex and not patient friendly..

2.
JAMA Netw Open ; 6(3): e235428, 2023 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-36988955

RESUMEN

Importance: Reducing rates of unnecessary cesarean deliveries is both a national and a global health objective. However, there are limited national US data on trends in indications for low-risk cesarean delivery. Objective: To determine temporal trends in and indications for cesarean delivery among patients at low risk for the procedure over a 20-year period. Design, Setting, and Participants: This cross-sectional study analyzed 2000 to 2019 delivery hospitalizations using the National Inpatient Sample. Births at low risk for cesarean delivery were identified using a definition from the Society for Maternal-Fetal Medicine and additional criteria. Temporal trends in cesarean birth were analyzed using joinpoint regression to estimate the average annual percentage change (AAPC) with 95% CIs. Data analysis was performed from August 2022 to January 2023. Exposure: This analysis evaluated cesarean birth trends in a population at low risk for this procedure over a 20-year period. Main Outcomes and Measures: In addition to overall cesarean birth risk, cesarean deliveries for nonreassuring fetal status and labor arrest were individually analyzed. Results: Of an estimated 76.7 million delivery hospitalizations, 21.5 million were excluded according to the Society for Maternal-Fetal Medicine definition, and 14.7 million were excluded according to additional criteria. Of the estimated 40 517 867 deliveries included, 12.1% (4 885 716 deliveries) were by cesarean delivery. Cesarean deliveries among patients at low risk for the procedure increased from 9.7% to 13.9% between 2000 and 2009, plateaued, and then decreased from 13.0% to 11.1% between 2012 and 2019. The AAPC for cesarean delivery was 6.4% (95% CI, 5.2% to 7.6%) from 2000 to 2005, 1.2% from 2005 to 2009 (95% CI, -1.2% to 3.7%), and -2.2% from 2009 to 2019 (95% CI, -2.7% to -1.8%). Cesarean delivery for nonreassuring fetal status increased from 3.4% of all deliveries in 2000 to 5.1% in 2019 (AAPC, 2.1%; 95% CI, 1.7% to 2.5%). Cesarean delivery for labor arrest increased from 3.6% in 2000 to a peak of 4.8% in 2009 before decreasing to 2.7% in 2019. Cesarean deliveries for labor arrest increased during the first half of the study (2000-2009) for the active phase (from 1.5% to 2.1%), latent phase (from 1.1% to 1.5%), and second stage (from 0.9% to 1.3%) and then decreased from 2010 to 2019, from 2.1% to 1.7% for the active phase, from 1.5% to 1.2% for the latent phase, and from 1.2% to 0.9% for the second stage. Conclusions and Relevance: Cesarean deliveries among patients at low risk for cesarean birth appeared to decrease over the latter years of the study period, with cesarean deliveries for labor arrest becoming less common.


Asunto(s)
Sufrimiento Fetal , Trabajo de Parto , Embarazo , Femenino , Humanos , Estudios Transversales , Cesárea , Parto
4.
Int J Gynaecol Obstet ; 152(2): 236-241, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-32839965

RESUMEN

OBJECTIVE: To create, implement, and evaluate the effectiveness of a cesarean delivery checklist on maternal and neonatal outcomes in a rural African hospital. METHODS: Based on input from local authorities, WHO's Safe Surgical Checklist was modified for cesarean delivery and adapted for use in low-resource settings. Retrospective chart review between April and August 2013 in Kibogora Hospital, Nyamasheke, Rwanda, included the first 100 women undergoing cesarean after checklist implementation and the last 100 women undergoing cesarean before implementation. Checklist utilization was determined and degree of completeness assessed. Outcomes were compared between patients for whom the checklist was utilized and patients for whom the checklist was not utilized, in both pre and post-implementation groups. RESULTS: Checklist utilization rate was 83.0% (83/100). Checklist utilization was associated with significant increases in documentation of estimated blood loss (91.6% [76/83] vs 0.9% [1/117], P<0.001) and antibiotic administration before incision (96.4% [80/83] vs 30.8% [36/117], P<0.001). It was also associated with decreased rates of hospitalization longer than the standard 4 days (19.3% [16/83] vs 70.1% [82/117], P<0.001). CONCLUSION: Implementation of a cesarean delivery checklist via a culturally specific and resource-specific strategy resulted in high utilization rates and improved performance in key best practices by healthcare providers.


Asunto(s)
Cesárea/métodos , Lista de Verificación , Tiempo de Internación , Adulto , Femenino , Hospitales , Humanos , Embarazo , Estudios Retrospectivos , Rwanda
5.
Am J Obstet Gynecol MFM ; 2(3): 100154, 2020 08.
Artículo en Inglés | MEDLINE | ID: mdl-32838260

RESUMEN

The novel coronavirus disease 2019 caused by the severe acute respiratory syndrome coronavirus 2 has become a pandemic. It has quickly swept across the globe, leaving many clinicians to care for infected patients with limited information about the disease and best practices for care. Our goal is to share our experiences of caring for pregnant and postpartum women with novel coronavirus disease 2019 in New York, which is the coronavirus disease 2019 epicenter in the United States, and review current guidelines. We offer a guide, focusing on inpatient management, including testing policies, admission criteria, medical management, care for the decompensating patient, and practical tips for inpatient antepartum service management.


Asunto(s)
Prueba de COVID-19 , COVID-19 , Parto Obstétrico , Atención Posnatal , Complicaciones Infecciosas del Embarazo , Atención Prenatal , Adulto , COVID-19/sangre , COVID-19/diagnóstico , COVID-19/epidemiología , COVID-19/terapia , Prueba de COVID-19/métodos , Parto Obstétrico/métodos , Parto Obstétrico/tendencias , Femenino , Humanos , Transmisión Vertical de Enfermedad Infecciosa/prevención & control , New York , Servicio de Ginecología y Obstetricia en Hospital/organización & administración , Servicio de Ginecología y Obstetricia en Hospital/tendencias , Manejo de Atención al Paciente/métodos , Manejo de Atención al Paciente/organización & administración , Manejo de Atención al Paciente/tendencias , Atención Posnatal/métodos , Atención Posnatal/normas , Guías de Práctica Clínica como Asunto , Embarazo , Complicaciones Infecciosas del Embarazo/sangre , Complicaciones Infecciosas del Embarazo/epidemiología , Complicaciones Infecciosas del Embarazo/terapia , Complicaciones Infecciosas del Embarazo/virología , Atención Prenatal/métodos , Atención Prenatal/normas , SARS-CoV-2/aislamiento & purificación
6.
Int J Gynaecol Obstet ; 148(1): 87-95, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31560131

RESUMEN

OBJECTIVE: To determine the rates of urinary tract infection (UTI) in adolescent users of menstrual pads versus non-users in a rural area of Rwanda. METHODS: An interventional prospective cohort study was conducted at four secondary schools in the Western Province of Rwanda from May 12, 2017 to October 20, 2017. Inclusion criteria were female students aged 18-24 who were menstruating and volunteered to participate in the study. In total, 240 adolescent participants were assigned to two cohorts; 120 received menstrual pads for 6 months and the other 120 did not use pads. Baseline symptoms and urine cultures were obtained. Symptoms and methods of menstrual hygiene management were assessed and urine cultures were obtained every 2 months. The primary outcome was the presence of UTI diagnosed by positive urine culture. Secondary outcomes were symptoms of UTI, vulvovaginal symptoms, sexual activity, dyspareunia, and self-reported sexually transmitted infection. Generalized estimating equations with nesting were used to assess associations of pad use with study outcomes. RESULTS: A total of 209 participants completed the study. There was no difference in rates of positive urine culture. A decreased odds of vulvovaginal symptoms was found in self-reported "always" versus "never" pad users (odds ratio [OR] 0.64, 95% confidence interval [CI] 0.43-0.96; P=0.031). CONCLUSIONS: Despite not finding any difference in rates of UTI, the present study showed a decreased rate of vulvovaginal symptoms in users of menstrual pads. Further research investigating rates of genital infections in this population is thus necessary.


Asunto(s)
Productos para la Higiene Menstrual/efectos adversos , Infecciones Urinarias/etiología , Adolescente , Salud del Adolescente , Estudios de Casos y Controles , Femenino , Conocimientos, Actitudes y Práctica en Salud , Humanos , Higiene , Menstruación/fisiología , Estudios Prospectivos , Rwanda , Autoinforme , Adulto Joven
7.
Semin Perinatol ; 43(1): 2-4, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30691692

RESUMEN

Obstetric hemorrhage is the leading cause of maternal morbidity and mortality in the world. Disparities in the prevalence of obstetric hemorrhage and its related mortality both on a global scale and locally in the United States indicate that a significant proportion is preventable. In many parts of the world, including the United States, there has also been an unexplainable increase in rates of postpartum hemorrhage. Efforts should focus on implementing comprehensive hemorrhage toolkit/bundles, which research has shown may have the potential to reduce severe maternal morbidity from hemorrhage.


Asunto(s)
Partería/normas , Complicaciones del Trabajo de Parto/terapia , Obstetricia/normas , Seguridad del Paciente/normas , Hemorragia Posparto/prevención & control , Transfusión Sanguínea/estadística & datos numéricos , Competencia Clínica , Países Desarrollados , Países en Desarrollo , Femenino , Disparidades en Atención de Salud/estadística & datos numéricos , Humanos , Comunicación Interdisciplinaria , Mortalidad Materna/tendencias , Complicaciones del Trabajo de Parto/mortalidad , Grupo de Atención al Paciente/normas , Hemorragia Posparto/mortalidad , Embarazo , Mejoramiento de la Calidad
8.
Int J Gynaecol Obstet ; 134(3): 350-3, 2016 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-27262941

RESUMEN

OBJECTIVE: To evaluate the long-term retention of skills gained by rural physicians who completed a postpartum hemorrhage simulation-training program. METHODS: A quasi-experimental pre-post intervention study enrolled a convenience sample of generalist physicians in rural Rwanda. Participants underwent initial simulation training including pre- and post-training testing in February 2012. Simulation drills to assess skill retention were conducted in March 2014. Participants were scored based on their communication, evaluation, and management skills. Median scores and inter-quartile ranges were calculated and the Wilcoxon signed-rank sum test was used to compare the pre-training, post-training, and retention scores. Physician confidence was assessed using a survey. RESULTS: In total, 11 physicians were enrolled; eight were available for the 2-year skill-retention evaluation. Significant improvements were observed when comparing participants' pre-training and post-training communication (P=0.03), evaluation (P=0.05), and management (P=0.02) scores, and there were no changes between participants' post-training and 2-year communication (P>0.99), evaluation (P=0.16), and management (P=0.46) scores. There were no differences in the self-reported confidence measures across the duration of the study. CONCLUSION: Simulation training is an effective method for teaching postpartum hemorrhage-management skills to generalist physicians in rural areas and skills are retained for at least 2 years. Further studies could determine the optimal time intervals for refresher training.


Asunto(s)
Competencia Clínica , Capacitación en Servicio , Hemorragia Posparto/terapia , Simulación por Computador , Femenino , Humanos , Masculino , Servicios de Salud Materna , Embarazo , Evaluación de Programas y Proyectos de Salud , Servicios de Salud Rural , Rwanda
9.
Artículo en Inglés | MEDLINE | ID: mdl-26550548

RESUMEN

OBJECTIVE: To evaluate the perceptions of healthcare and traditional medicine providers regarding the type, indications, side effects, and prevalence of traditional medicine use amongst pregnant women in a rural Rwandan population. METHODS: Six focus groups with physicians, nurses, and community health workers and four individual in-depth interviews with traditional medicine providers were held. Qualitative data was gathered using a structured questionnaire querying perceptions of the type, indications, side effects, and prevalence of use of traditional medicines in pregnancy. RESULTS: The healthcare provider groups perceived a high prevalence of traditional botanical medicine use by pregnant women (50-80%). All three groups reported similar indications for use of the medicines and the socioeconomic status of the pregnant women who use them. The traditional medicine providers and the healthcare providers both perceived that the most commonly used medicine is a mixture of many plants, called Inkuri. The most serious side effect reported was abnormally bright green meconium with a poor neonatal respiratory drive. Thirty-five traditional medicines were identified that are used during pregnancy. CONCLUSION: Perceptions of high prevalence of use of traditional medicines during pregnancy with possible negative perinatal outcomes exist in areas of rural Rwanda.

10.
Postgrad Med J ; 91(1082): 685-91, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26508720

RESUMEN

BACKGROUND: Benefits of exposure to global health training during medical education are well documented and residents' demand for this training is increasing. Despite this, it is offered by few US obstetrics and gynaecology (OBGYN) residency training programmes. OBJECTIVES: To evaluate interest, perceived importance, predictors of global health interest and barriers to offering global health training among prospective OBGYN residents, current OBGYN residents and US OGBYN residency directors. METHODS: We designed two questionnaires using Likert scale questions to assess perceived importance of global health training. The first was distributed to current and prospective OBGYN residents interviewing at a US residency programme during 2012-2013. The second questionnaire distributed to US OBGYN programme directors assessed for existing global health programmes and global health training barriers. A composite Global Health Interest/Importance score was tabulated from the Likert scores. Multivariable linear regression was performed to assess for predictors of Global Health Interest/Importance. RESULTS: A total of 159 trainees (77%; 129 prospective OBGYN residents and 30 residents) and 69 (28%) programme directors completed the questionnaires. Median Global Health Interest/Importance score was 7 (IQR 4-9). Prior volunteer experience was predictive of a 5-point increase in Global Health Interest/Importance score (95% CI -0.19 to 9.85; p=0.02). The most commonly cited barriers were cost and time. CONCLUSION: Interest and perceived importance of global health training in US OBGYN residency programmes is evident among trainees and programme directors; however, significant financial and time barriers prevent many programmes from offering opportunities to their trainees. Prior volunteer experience predicts global health interest.


Asunto(s)
Competencia Clínica/normas , Salud Global , Ginecología/educación , Internado y Residencia , Obstetricia/educación , Médicos , Estudiantes , Salud de la Mujer/normas , Curriculum , Salud Global/normas , Humanos , Estudios Prospectivos , Encuestas y Cuestionarios , Estados Unidos
11.
Matern Child Health J ; 19(9): 1949-55, 2015 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-25652061

RESUMEN

To evaluate the effectiveness of decentralizing ambulatory reproductive and intrapartum services to increase rates of antenatal care (ANC) utilization and skilled attendance at birth (SAB) in Rwanda. A prospective cohort study was implemented with one control and two intervention sites: decentralized ambulatory reproductive healthcare and decentralized intrapartum care. Multivariate logistic regression analysis was performed with primary outcome of lack of SAB and secondary outcome of ≥3 ANC visits. 536 women were entered in the study. Distance lived from delivery site significantly predicted SAB (p = 0.007), however distance lived to ANC site did not predict ≥3 ANC visits (p = 0.81). Neither decentralization of ambulatory reproductive healthcare (p = 0.10) nor intrapartum care (p = 0.40) was significantly associated with SAB. The control site had the greatest percentage of women receive ≥3 ANC visits (p < 0.001). Receiving <3 ANC visits was associated with a 3.98 times greater odds of not having SAB (p = 0.001). No increase in adverse outcomes was found with decentralization of ambulatory reproductive health care or intrapartum care. The factors that predict utilization of physically accessible services in rural Africa are complex. Decentralization of services may be one strategy to increase rates of SAB and ANC utilization, but selection biases may have precluded accurate analysis. Efforts to increase ANC utilization may be a worthwhile investment to increase SAB.


Asunto(s)
Competencia Clínica/normas , Conocimientos, Actitudes y Práctica en Salud , Servicios de Salud Materna/normas , Parto , Atención Prenatal/normas , Población Rural , Adolescente , Estudios de Cohortes , Femenino , Humanos , Servicios de Salud Materna/estadística & datos numéricos , Política , Embarazo , Atención Prenatal/estadística & datos numéricos , Estudios Prospectivos , Rwanda , Adulto Joven
12.
Am J Perinatol ; 31(6): 529-34, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24000107

RESUMEN

OBJECTIVE: To study the impact of a prenatal electronic medical record (EMR) on the adequacy of documentation. STUDY DESIGN: The authors reviewed paper prenatal records (historical control arm and contemporaneous control arm), and prenatal EMRs (study arm). A prenatal quality index (PQI) was developed to assess adequacy of documentation; the prenatal record was assigned a score (range, -1 to 2 for each element, maximum score = 30). A PQI raw score and PQI ratio-that controlled for which elements of care were indicated for a patient-were calculated and compared between the study arm versus historical control arm and then the study arm versus contemporaneous control arm. RESULTS: The median PQI raw score was significantly lower in the study arm compared with historical control arm; however, the PQI ratios were similar between these groups. The PQI raw score was similar in both the study arm and contemporaneous control arm; however the PQI ratio was significantly higher in the study arm when compared with the contemporaneous control arm. CONCLUSION: Implementation of this prenatal EMR did not have a significant impact on completeness of documentation when compared with a standardized paper prenatal record. Adequacy of documentation seems to be related to the type of practice.


Asunto(s)
Documentación/normas , Registros Electrónicos de Salud , Atención Prenatal , Mejoramiento de la Calidad , Servicios Urbanos de Salud/organización & administración , Adulto , Femenino , Humanos , Embarazo , Adulto Joven
13.
J Low Genit Tract Dis ; 15(4): 296-302, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21959573

RESUMEN

OBJECTIVE: : In 2006, the American Society for Colposcopy and Cervical Pathology updated evidence-based guidelines recommending screening intervals for women with abnormal cervical cytology diagnosis. In our low-income inner-city population, we sought to improve performance by uniformly applying the guidelines to all patients. We report the prospective performance of a comprehensive tracking, evidence-based algorithmically driven call back, and appointment scheduling system for cervical cancer screening in a resource-limited inner-city population. MATERIALS AND METHODS: : Outreach efforts were formalized with algorithm-based protocols for triage to colposcopy, with universal adherence to evidence-based guidelines. During implementation from August 2006 to July 2008, we prospectively tracked performance using the electronic medical record with administrative and pathology reports to determine performance variables such as the total number of Pap tests, colposcopy visits, and the distribution of abnormal cytology and histology results, including all cervical intraepithelial neoplasia 2, 3 diagnoses. RESULTS: : A total of 86,257 gynecologic visits and 41,527 Pap tests were performed system-wide during this period of widespread and uniform implementation of standard cervical cancer screening guidelines. The number of Pap tests performed per month varied little. The incidence of CIN 1 significantly decreased from 117 (68.4%) of 171 during the first tracked month to 52 (54.7%) of 95 during the last tracked month (p = 0.04). The monthly incidence rate of CIN 2, 3, including incident cervical cancers, did not change. The total number of colposcopy visits declined, resulting in a 50% decrease in costs related to colposcopy services and approximately a 12% decrease in costs related to excisional biopsies. CONCLUSIONS: : Adherence to cervical cancer screening guidelines reduced the number of unnecessary colposcopies without increasing numbers of potentially missed CIN 2, 3 lesions, including cervical cancer. Uniform implementation of administrative-based performance initiatives for cervical cancer screening minimizes differences in provider practices and maximizes performance of screening while containing cervical cancer screening costs.


Asunto(s)
Detección Precoz del Cáncer/métodos , Displasia del Cuello del Útero/diagnóstico , Neoplasias del Cuello Uterino/diagnóstico , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Citas y Horarios , Femenino , Adhesión a Directriz , Hospitales Urbanos , Humanos , Persona de Mediana Edad , Guías de Práctica Clínica como Asunto , Adulto Joven
14.
Am J Obstet Gynecol ; 200(5): e40-2, 2009 May.
Artículo en Inglés | MEDLINE | ID: mdl-19111717

RESUMEN

OBJECTIVE: The objective of this study is to gain insight into the nature of obstetric fistulae in Africa through patient perspectives. STUDY DESIGN: At l'Hôpital Saint Jean de Dieu in Tanguieta, Benin, 37 fistula patients underwent structured interviews about fistula cause, obstacles to medical care, prevention, and reintegration by 2 physicians via interpreters. RESULTS: The majority of participants (43%) thought their fistulae were a result of trauma from the operative delivery. Lack of financial resources (49%) was the most commonly reported obstacle to care, and prenatal care (38%) was most frequently reported as an intervention that may prevent obstetric fistulae. The majority (49%) of the participants requested no further reintegration assistance aside from surgery. CONCLUSION: Accessible emergency obstetric care is necessary to decrease the burden of obstetric fistulae in Africa. This may be accomplished through increased and improved health care facilities and education of providers and patients.


Asunto(s)
Accesibilidad a los Servicios de Salud/estadística & datos numéricos , Complicaciones del Trabajo de Parto/epidemiología , Complicaciones del Trabajo de Parto/psicología , Fístula Vesicovaginal/epidemiología , Fístula Vesicovaginal/psicología , África Occidental/epidemiología , Actitud Frente a la Salud , Parto Obstétrico , Femenino , Salud Global , Costos de la Atención en Salud , Accesibilidad a los Servicios de Salud/economía , Humanos , Morbilidad , Complicaciones del Trabajo de Parto/cirugía , Procedimientos Quirúrgicos Obstétricos/economía , Procedimientos Quirúrgicos Obstétricos/estadística & datos numéricos , Embarazo , Encuestas y Cuestionarios , Fístula Vesicovaginal/cirugía
15.
J Acquir Immune Defic Syndr ; 34(2): 237-41, 2003 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-14526214

RESUMEN

OBJECTIVE: As a result of the HIV epidemic in Africa, much debate exists on whether institutionalized compared with community-based care provides optimum management of infected children. Previous reports calculated 89% mortality by age 3 years among outpatients in Malawi. No similar data are available for infected children in institutionalized care. We characterized patterns of morbidity and mortality among HIV-1-infected children residing at an orphanage in Nairobi. METHODS: Medical records for 174 children followed over 5 years were reviewed. Mortality was analyzed by Kaplan-Meier methods with adjustment to account for survival in the community before admission. Anthropometric indices were calculated to include mean z scores for weight for length and length for age. Low indices reflected wasting and stunting. Opportunistic infections were documented. RESULTS: Of 174 children, 64 had died. Survival was 70% at age 3 years. Morbidity included recurrent respiratory tract infections, gastroenteritis, parotitis, and lymphoid interstitial pneumonitis. No new cases of tuberculosis disease were noted after admission. Mean z scores for length for age suggested overall stunting (z = -1.65). Wasting was not observed (z = -0.39). CONCLUSION: The optimal form of care for HIV-infected children in resource-poor settings may be the development of similar homes. Absence of tuberculosis disease in long-standing residents may have contributed to improved survival. Stunting in the absence of wasting implied that growth was compromised by opportunistic infections and other cofactors.


Asunto(s)
Síndrome de Inmunodeficiencia Adquirida/mortalidad , Niño Institucionalizado , Crecimiento , VIH-1 , Síndrome de Inmunodeficiencia Adquirida/fisiopatología , Adolescente , Niño , Preescolar , Estudios de Cohortes , Humanos , Lactante , Kenia/epidemiología , Morbilidad , Estudios Retrospectivos
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