Affiliation: | 1. Department of General surgery, KMKM Hospital Zanzibar Tanzania, PO BOX 565;2. Department of Hepatobiliary Surgery, Dalian Municipal Central Hospital Affiliation of Dalian Medical University, Dalian, 116033, PR China;2. Department of Speech and Hearing Sciences, Indiana University, Bloomington, Indiana;3. Department of Surgery Division of Otolaryngology, School of Medicine and Public Health, University of Wisconsin Madison, Madison, Wisconsin |