1. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea.
2. Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Gastroenterology, Gyeongsang National University School of Medicine, Jinju, Korea.
4. Department of Gastroenterology, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Gastroenterology, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea.
7. Department of Gastroenterology, Dankook University College of Medicine, Cheonan, Korea.
8. Department of Gastroenterology, The Catholic University of Korea College of Medicine, Seoul, Korea.
9. Department of Gastroenterology, Soonchunhyang University Hospital, Seoul, Korea.
10. Department of Gastroenterology, Keimyung University School of Medicine, Daegu, Korea.
11. Department of Gastroenterology, Ewha Womans University School of Medicine, Seoul, Korea.
12. Department of Gastroenterology, Chung-Ang University College of Medicine, Seoul, Korea.
13. Department of Gastroenterology, Pusan National University School of Medicine, Busan, Korea.
14. Department of Gastroenterology, Dongguk University Ilsan Hospital, Goyang, Korea.
15. Department of Gastroenterology, Eulji University School of Medicine, Seoul, Korea.