1. Institute for Medical Information Processing, Biometry and Epidemiology, LMU Munich, Munich, Germany
2. Pettenkofer School of Public Health, LMU Munich, Munich, Germany
3. National Institute for Medical Research, Mwanza, Tanzania
4. Mwanza Intervention Trials Unit, Mwanza, Tanzania
5. Infectious Disease Epidemiology Department, London School of Hygiene & Tropical Medicine, London, UK