1. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Catholic University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Seoul National University, Seoul, Korea
4. Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Jeollabuk-do, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
6. Department of Internal Medicine, Yonsei University Gangnam Hospital, Seoul, Korea
7. Department of Internal Medicine, Konkuk University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Kangbuk Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea
10. Department of Internal Medicine, Kyunghee University College of Medicine, Seoul, Korea
11. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
12. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
13. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
14. Department of Internal Medicine, Keimyung University College of Medicine, Daegu, Korea
15. Department of Internal Medicine, Ajou University College of Medicine, Suwon, Gyeonggi-do, Korea
16. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea