1 Department of Radiology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2 Digestive Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
3 Digestive Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran.
4 Department of Radiology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: radmard@tums.ac.ir.