1. Department of Epidemiology University of Washington Seattle WA USA
2. Department of Global Health University of Washington Seattle WA USA
3. Department of Infectious Disease EpidemiologyLondon School of Hygiene and Tropical Medicine London United Kingdom
4. School of Public Health Imperial College London London United Kingdom
5. Global HIV, Hepatitis and STIs programme World Health Organization Geneva Switzerland
6. Communicable Diseases ClusterWorld Health Organization Accra Ghana