1 Department of Gastroenterology, Institute of Gastrosciences and Liver Transplantation, Apollo Multispeciality Hospitals, 54 Canal Circular Road, Kolkata, 700 054, India.
2 Department of Gastroenterology, Institute of Gastrosciences and Liver Transplantation, Apollo Multispeciality Hospitals, 54 Canal Circular Road, Kolkata, 700 054, India. mkgkolkata@gmail.com.