1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
2. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
6. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea
7. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea
8. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea
9. Department of Internal Medicine, Chosun University College of Medicine, Gwangju,Korea
10. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
11. Department of Internal Medicine, Eulji Hospital, Eulji University College of Medicine, Seoul, Korea