1. Duke University School of Medicine; Duke University; Duke University Medical Center Greenspace; Durham NC USA
2. Tulane University School of Public Health and Tropical Medicine; New Orleans LA USA
3. Mother and Child Health Research Department; Institute for Clinical Effectiveness and Health Policy (IECS-CONICET); Buenos Aires Argentina
4. Hospital Nacional A. Posadas; El Palomar Buenos Aires Province Argentina
5. Centro de Educación Médica e Investigaciones Clínicas; ‘Norberto Quirno’ (CEMIC); Autonomous City Buenos Aires Argentina
6. Sanatorio de la Mujer; Rosario Santa Fe Province Argentina
7. Instituto de Maternidad y Ginecología Nuestra Señora de las Mercedes; San Miguel de Tucumán Tucumán Province Argentina