1. Department of Gastroenterology and Hepatology, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, Uijeongbu, Gyeonggi 11765, Republic of Korea
2. Department of Pathology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Republic of Korea
3. Department of Gastroenterology and Hepatology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Republic of Korea
4. Department of Gastroenterology and Hepatology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Republic of KoreaJONG YOUNG CHOI
5. Department of Radiology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Republic of Korea