1. Heidelberg Institute of Global Health, Im Neunheimer Feld 130/3, 69120 Heidelberg, Germany
2. EngenderHealth Tanzania, Mwai Kibaki Road, 113 Mikocheni, Dar es Salaam 78167, Tanzania
3. School of Public Health and Epidemiology, Muhimbili University of Health and Allied Sciences, Dar es Salaam 65105, Tanzania
4. School of Medicine, Muhimbili University of Health and Allied Sciences, Dar es Salaam 65001, Tanzania