1. World Health Organization; Avenue Via Appia 20 Geneva Switzerland CH-1202
2. World Health Organization; Department of Reproductive Health and Research; 20 Rue Appia Geneva 27 Switzerland CH-1211
3. World Health Organization; UNDP/UNFPA/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Department of Reproductive Health and Research; 20 Avenue Appia Geneva Switzerland 1211
4. University of the Witwatersrand, University of Fort Hare, Eastern Cape Department of Health; Department of Obstetrics and Gynaecology, East London Hospital Complex; Frere and Cecilia Makiwane Hospitals Private Bag X 9047 East London Eastern Cape South Africa 5200
5. China Welfare Institute; International Peace Maternity and Child Health Hospital (IPMCH); 145 Guangyuan Road 910 Hengshan Road Shanghai China 200030
6. Geneva Foundation for Medical Education and Research; Chemin Edouard Tavan 5 Geneva Switzerland