Surinder Singh Rana1, Pankaj Gupta2, Ravi Sharma2, Rajesh Gupta3. 1. Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), India. Electronic address: rana.surindersingh@pgimer.edu.in. 2. Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), India. 3. Department of Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), India.