Surinder Singh Rana1, Rajesh Gupta2. 1. Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh, Punjab, 160012, India. 2. Department of Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh, Punjab, 160012, India.