1. School of Nursing, College of Health Sciences, University of Dodoma, P.O. Box, 395, Dodoma, Tanzania
2. School of Public Health, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, Dar es Salaam, Tanzania
3. School of Medicine, College of Health Sciences, University of Dodoma, P.O. Box 395, Dodoma, Tanzania