1. Department of Pediatrics, Bugando Medical Centre, P.O. Box 1370, Mwanza, Tanzania
2. Department of Pediatrics, Catholic University of Health and Allied Sciences-Bugando, P.O. Box 1464, Mwanza, Tanzania
3. Department of Otorhinolaryngology, Bugando Medical Centre, P.O. Box 1370, Mwanza, Tanzania
4. Department of Internal Medicine, Bugando Medical Centre, P.O. Box 1370, Mwanza, Tanzania
5. Department of Internal Medicine, Catholic University of Health and Allied Sciences-Bugando, P.O. Box 1464, Mwanza, Tanzania