1. Geneva Foundation for Medical Education and Research; Route de Florissant 3 Geneva Switzerland CH-1208
2. Westminster Primary Care Trust; Raymede Clinic, Westside Contraceptive Services; Exmoor St London UK W10 6DZ
3. Leiden University Medical Center; Dept. of Gynaecology, Division of Reproductive Medicine and Dept. of Clinical Epidemiology; PO Box 9600 Albinusdreef 2 Leiden Netherlands NL 2300 RC
4. World Health Organization; Department of Reproductive Health and Research; Avenue Via Appia Geneva 27 Switzerland Ch 1211
5. WHO; Reproductive Health and Research; Avenue Appia Building Geneva 27 Switzerland CH 1211