1. Institute for Medical Information Processing, Biometry and Epidemiology, Medical Faculty, Ludwig-Maximilians-University, Munich, Germany
2. Pettenkofer School of Public Health, Munich, Germany
3. National Institute for Medical Research, Mwanza, Tanzania
4. Mwanza Intervention Trials Unit, Mwanza, Tanzania
5. Department of Infectious Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
6. Department of Global Health and Development, London School of Hygiene and Tropical Medicine, UK