1. Population Council, Suite 280, 4301 Connecticut Avenue NW, Washington, DC 20008, USA
2. International Planned Parenthood Foundation, 4 Newhams Row, London SE1 3UZ, UK
3. World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland
4. UNFPA, 605 Third Avenue, New York, NY 10158, USA and
5. Faculty of Public Health & Policy, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK