1. Internal Medicine, Benazir Bhutto Hospital, Rawalpindi, Pakistan
2. Internal Medicine, Shifa International Hospital, Islamabad, Pakistan
3. Internal Medicine, Basic Health Unit, Shorkot, Pakistan
4. Internal Medicine, Rawalpindi Medical University, Pakistan
5. Gastroenterology Department, Buch International Hospital, Multan, Pakistan
6. Internal Medicine, Naqaish Medicare, Islamabad, Pakistan