1. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Eulji University School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
5. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
6. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea.
7. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Korea.
9. Steering Committee for Clinical Practice Guideline, Korean Academy of Medical Science, Seoul, Korea.
10. Department of Preventive Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
11. Department of Surgery, Ajou University School of Medicine, Suwon, Korea.