1. Department of Public Health, Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
2. Heidelberg Institute of Global Health, Heidelberg University Hospital Heidelberg Germany
3. Centre for Sexual Health and HIV/AIDS Research (CeSHHAR) Harare Zimbabwe
4. Infectious Disease Epidemiology London School of Hygiene and Tropical Medicine London UK
5. National AIDS Council of Zimbabwe Harare Zimbabwe
6. Department of International Public Health Liverpool School of Tropical Medicine Liverpool UK