1. Medical College, Aga Khan University, Karachi, Pakistan
2. Department of Surgery, University Hospitals Birmingham, United Kingdom
3. Department of Surgery, Section of Otolaryngology, Head and Neck Surgery, Aga Khan University Hospital, Karachi, Pakistan
4. Gastroenterology and Surgery Service Line, Aga Khan University Hospital, Karachi, Pakistan
5. Department of Community Health Sciences, Medical College, Aga Khan University, Karachi, Pakistan