1Department of Gastroenterology, Taleghani Hospital, Tehran, Iran
2Gastroenterologist, Research Center for Gastroenterology and Liver Disease, Shaheed Beheshti University of Medical Sciences, Tehran, Iran
3Associate Professor of Gastroenterology, Department of Internal Medicine, Baqiatollah Medical University; Head of Tehran Hepatitis Center, Tehran, Iran
4Iran Blood Transfusion Organization, Tehran, Iran
5Research Fellow, Research Center for Gastroenterology and Liver Disease, Shaheed Beheshti University of Medical Sciences, Tehran, Iran
6Assistant Professor of Gastroenterology, Department of Gastroenterology, Taleghani Hospital, Tehran, Iran
7Professor of Gastroenterology, Department of Gastroenterology, Taleghani Hospital, Head of Research Center of Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran