1. Fetal Medicine Unit, Department of Obstetrics and Gynecology; Hospital Carlos Van Buren; Valparaíso Chile
2. Department of Obstetrics and Gynecology, Faculty of Medicine; Universidad de Valparaíso; Valparaíso Chile
3. Biomedical Research Centre, Faculty of Medicine; Universidad de Valparaíso; Valparaíso Chile
4. Department of Public Health, Faculty of Medicine; Universidad de Valparaíso; Valparaíso Chile
5. Pathology Department; Hospital Carlos Van Buren; Valparaíso Chile
6. Fetal Medicine Unit, Department of Obstetrics and Gynecology; Hospital Clínico Universidad de Chile; Santiago de Chile Chile