1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hallym Medical Center Hallym University College of Medicine Chuncheon Republic of Korea
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Wonju Severance Christian Hospital Yonsei University Wonju College of Medicine Wonju Republic of Korea
4. Division of Gastroenterology, Department of Internal Medicine Korea University Medical Center Seoul Republic of Korea
5. Division of Gastroenterology and Hepatology Department of Internal Medicine, College of Medicine The Catholic University of Korea Seoul Republic of Korea
6. Division of Gastroenterology and Hepatology, Department of Internal Medicine Hanyang University College of Medicine Seoul Republic of Korea
7. Division of Gastroenterology and Hepatology, Department of Internal Medicine Inje University Sanggye Paik Hospital Seoul Republic of Korea
8. Division of Gastroenterology and Hepatology, Department of Internal Medicine Soonchunhyang University College of Medicine Seoul Republic of Korea
9. Division of Gastroenterology and Hepatology, Department of Internal Medicine Soonchunhyang University Bucheon Hospital Bucheon Republic of Korea
10. Division of Gastroenterology and Hepatology, Department of Internal Medicine Yeungnam University College of Medicine Daegu Republic of Korea
11. Division of Gastroenterology and Hepatology, Department of Internal Medicine Seoul Metropolitan Government Seoul National University Boramae Medical Center Seoul Republic of Korea