1. Department of Clinical Pharmacology & PharmacoepidemiologyHeidelberg University Hospital, Heidelberg, Germany
2. Directorate of Information and Communication TechnologyMuhimbili University of Health and Allied Sciences (MUHAS), Dar es Salaam, Tanzania
3. Navrongo Health Research Centre, Navrongo, Ghana
4. Department of Epidemiology and BiostatisticsSchool of Public Health and Social Sciences, Muhimbili University of Health and Allied Sciences (MUHAS), Dar es Salaam, Tanzania