1. The University of Liverpool; C/o Cochrane Pregnancy and Childbirth Group, Department of Women's and Children's Health; First Floor, Liverpool Women's NHS Foundation Trust Crown Street Liverpool UK L8 7SS
2. Bill & Melinda Gates Foundation; Cost-Effectiveness, Integrated Delivery, Global Development; Seattle USA WA 98102
3. Fundacion Universitaria de Ciencias de la Salud, Hospital de San José; Department of Critical Care; Carrera 19 # 8-32 Bogota Bogota Colombia 11001
4. Faculty of Medicine, Universidad Nacional de Colombia; Department of Obstetrics and Gynecology; Carrera 30 No 45-03 Bogota Colombia