Affiliation: | aDivision of Surgical Gastroenterology, School of Digestive and Liver Diseases, Institute of Postgraduate Medical Education and Research, 244 A.J.C. Bose Road, Kolkata 700020, West Bengal, India;bDivision of Gastroenterology, School of Digestive and Liver Diseases, Institute of Postgraduate Medical Education and Research, Kolkata, West Bengal, India;cDivision of GI Pathology, School of Digestive and Liver Diseases, Institute of Postgraduate Medical Education and Research, Kolkata, West Bengal, India |