1. Department of Epidemiology and Biostatistics, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
2. Department of Community Medicine and Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
3. Department of Public Health, University of Copenhagen, Copenhagen, Denmark
4. National AIDS Control Programme, Ministry of Health, Community Development, Gender, Elderly and Children, Dodoma, Tanzania