1. Oregon Health and Science University; Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine; 3181 SW Sam Jackson Park Road Portland Oregon USA 97239
2. King Edward Memorial Hospital for Women; 374 Bagot Road Subiaco WA Australia 6008
3. University of Liverpool; Cochrane Pregnancy and Childbirth Group, Department of Women's and Children's Health; Liverpool UK
4. Global Network for Perinatal and Reproductive Health; Portland OR USA
5. Universidad de Antioquia; Departamento de Obstetricia y Ginecología; Medellín Colombia
6. FUNDARED-MATERNA; Bogotá Colombia
7. St. Luke’s University Health Network; Department of Obstetrics & Gynecology, Division of Maternal Fetal Medicine; Bethlehem PA USA