1 Assistant Professor of Internal Medicine, Digestive Disease Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
2 Assistant Professor of Internal Medicine, Department of Internal Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3 Associate Professor of Anatomical and Clinical Pathology, Department of Pathology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.