1. Department of Epidemiology; Harvard T.H. Chan School School of Public Health Boston; Boston MA USA
2. Department of Endocrinology; Instituto Nacional Materno Perinatal; Lima Peru
3. Universidad Nacional Mayor de San Marcos; Lima Peru
4. Center for Perinatal Studies; Swedish Medical Center; Seattle WA USA
5. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore MD USA
6. Universidad Peruana de Ciencias Aplicadas; Lima Peru