1. Professor of gastroenterology and hepatology, Department of gastroenterology and hepatology, Taleghani hospital, Shahid Beheshti University of medical sciences, Tehran, Iran
2. Fellowship of gastroenterology and hepatology, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3. Professor of pathology, Department of pathology, Taleghani hospital, Shahid Beheshti University of medical sciences, Tehran, Iran