1. Department of Sexual and Reproductive Health, National Institute for Medical Research, Mwanza, Tanzania
2. Mwanza Intervention Trials Unit, Mwanza, Tanzania
3. Gender Violence and Health Centre, Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, UK
4. Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
5. Institute for Medical Information Processing, Biometry, and Epidemiology, Ludwig Maximilian University of Munich