1. Department of Gastroenterology, Dayanand Medical College , Ludhiana, Punjab , India
2. Department of Medicine, Dayanand Medical College , Ludhiana, Punjab , India
3. Division of Gastroenterology, Hepatology, & Nutrition, Allegheny Health Network , Pittsburgh, PA , USA
4. Center for Interventional Inflammatory Bowel Disease, Columbia University Irving Medical Center, New York Presbyterian Hospital , New York, NY , USA