1. Department of Reproductive Health and Research, World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland.
2. School of Mathematics and Statistics, University of Melbourne, Melbourne, Australia.
3. Avenir Health, Geneva, Switzerland.
4. Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland.
5. WHO Collaborating Centre for Gonorrhoea and Other STIs, Örebro University, Örebro, Sweden.
6. Department of Healthcare Policy and Research, Weill Cornell Medical College – Qatar, Doha, Qatar.
7. Department of Disease Control, London School of Hygiene & Tropical Medicine, London, England.
8. Enteric and Sexually Transmitted Infections Branch, National Institute of Allergy and Infectious Diseases, Washington DC, United States of America.