1. Institute of Public Health, Department of Epidemiology and Biostatistics, Kilimanjaro Christian Medical University College (KCMUCo), Moshi, Tanzania
2. Amref Health Africa, Dar es Salaam, Tanzania
3. Department of Public Health, College of Health Sciences, Dodoma University, Dodoma, Tanzania
4. Department of Community Health Nursing, School of Nursing, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
5. Department of Development Studies, School of Public Health and Social Sciences, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
6. Department of Translational Medicine, Register-based Epidemiology, Lund University, Lund, Sweden