1. Department of Public Health, Faculty of Medicine, Gulu University, P.O. Box 166, 00256 Gulu, Uganda
2. Department of Surgery, Gulu University, P.O. Box 166, 00256 Gulu, Uganda
3. Department of Community Health and Behavioural Sciences, Makerere University, P.O Box 7072, 00256 Kampala, Uganda