1. Department of HIV/AIDS, World Health Organization, 20 avenue Appia, 1211 Geneva 27, Switzerland.
2. Mailman School of Public Health, Columbia University, New York, United States of America (USA).
3. Technical and Operations Support Department, Joint United Nations Programme on HIV/AIDS, Geneva, Switzerland.
4. HIV/AIDS Programme Division, United Nations Children’s Fund, New York, USA.
5. Global Health Programme, Bill & Melinda Gates Foundation, Seattle, USA.