1. University of the Witwatersrand/University of Fort Hare/East London Hospital Complex; Effective Care Research Unit; East London South Africa
2. Leiden University Medical Center; Gynaecology, Division of Reproductive Medicine and Dept. of Clinical Epidemiology; PO Box 9600 Albinusdreef 2 Leiden Netherlands NL 2300 RC
3. Medical College Baroda; Department of OBGYN; Race Coarse Road Baroda 390007 India
4. World Health Organization; Avenue Via Appia 20 Geneva Switzerland CH-1202
5. Leiden University Medical Center; Department of Obstetrics; PO Box 9600 Leiden Netherlands 2300 RC
6. 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