1. Department of Radiology, Ajou University Hospital, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, 16499, South Korea
2. Present affiliation: Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
3. Department of Gastroenterology, Ajou University Hospital, Ajou University School of Medicine, Suwon, South Korea