1. Integrative Cancer Center, CHA Ilsan Medical Center, Goyang, Korea
2. Department of Oncology and Hematology, CHA Ilsan Medical Center, CHA University, Goyang, Korea
3. Department of Internal Medicine, Korea University College of Medicine, Korea University Guro Hospital, Seoul, Korea
4. Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
5. Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu Catholic University School of Medicine, Daegu, Korea
6. Department of Internal Medicine, The Catholic University of Korea, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
7. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
9. Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University College of Medicine, Seoul, Korea
10. Department of Internal Medicine, Hanyang University Seoul Hospital, Hanyang University School of Medicine, Seoul, Korea
11. Department of Gastroenterology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
12. Department of Gastroenterology, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea
13. Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
14. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
15. Department of Gastroenterology and Hepatology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea