1. School of Nursing and Midwifery, Aga Khan University, Karachi, Pakistan
2. Department of Gastroenterology, Aga Khan University Hospital, Karachi, Pakistan
3. Medical College, Aga Khan University, Karachi, Pakistan
4. Clinical Trials Unit, Aga Khan University Hospital, Karachi, Pakistan
5. Department of Gastroenterology, Liaquat National Hospital, Karachi, Pakistan