1. Division of Gastroenterology, Department of Internal Medicine and Gastrointestinal Cancer Center, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Division of Gastroenterology, Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Inje University College of Medicine, Haeundae Paik Hospital, Busan, Korea.
4. Division of Gastroenterology, Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
5. Division of Gastroenterology, Department of Internal Medicine, College of Medicine, Incheon St. Mary’s Hospital, The Catholic University of Korea, Incheon, Korea.
6. Division of Gastroenterology, Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Food Science and Biotechnology, Sejong University, Seoul, Korea.
9. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
10. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.