1. Department of Internal Medicine Liaquat National Hospital and Medical College Karachi Pakistan
2. Department of Internal Medicine Dow University of Health Sciences Karachi Pakistan
3. Department of Gastroenterology Liaquat National Hospital and Medical College Karachi Pakistan
4. Bukovinian State Medical University Chernivtsi Ukraine
5. Department of Histopathology Liaquat National Hospital and Medical College Karachi Pakistan