1. Department of Internal Medicine, Gyeongsang National University School of Medicine Gyeongsang National University Changwon Hospital, Changwon, Gyeongsangnam-do, Korea
2. Department of Internal Medicine, Konkuk University Medical Center, Seoul, Korea
3. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
4. Department of Gastroenterology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
6. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
7. Department of Internal Medicine, Wonkwang University College of Medicine and Digestive Disease Research Institute, Iksan, Jeollabuk-do, Korea
8. Department of Internal Medicine, Kyungpook National University School of Medicine Kyungpook National University Hospital, Daegu, Korea
9. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Samsung Changwon Hospital, Sungkyunkwan University of Medicine, Changwon, Gyeongsangnam-do, Korea
10. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea
11. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea