1. Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden
2. Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
3. National Institute of Transport, Dar es Salaam, Tanzania
4. Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, Stockholm, Sweden
5. Center for Epidemiology and Community Medicine, Stockholm, Sweden