1. Endoscopic unit, Catholic University of Health and Allied Sciences-Bugando, Mwanza, Tanzania;
2. Department of Internal Medicine, Catholic University of Health and Allied Sciences-Bugando, Mwanza, Tanzania;
3. Department of Internal Medicine, Cornell Medical College, USA;
4. Department of Microbiology, Catholic University of Health and Allied Sciences-Bugando, Mwanza, Tanzania;
5. Department of Parasitology, Catholic University of Health and Allied Sciences-Bugando, Mwanza, Tanzania;
6. Department of Pathology and Laboratory Medicine, Weill Cornell Medical College;
7. Department of Surgery, Muhimbili University of Health and Allied Sciences, Dar Es Salaam, Tanzania;
8. Department of Tropenmedizin, Missionsärztliche Klinik, Würzburg, Germany;
9. Department of Surgery, Catholic University of Health and Allied Sciences-Bugando, Mwanza, Tanzania