1. Department of Internal Medicine, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
2. Department of Internal Medicine, Myongji Hospital, Goyang, Republic of Korea
3. Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
4. Division of Gastroenterology, Department of Internal Medicine, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University of Korea, Seoul, Republic of Korea
5. Department of Internal Medicine, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
6. Department of Internal Medicine, Uijungbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Uijungbu, Republic of Korea
7. Department of Internal Medicine, Bucheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Republic of Korea
8. Department of Hospital Pathology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea