1. Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Korea
3. Department of Internal Medicine, Hallym University College of Medicine, Anyang, Korea
4. Department of Internal Medicine, Kwangju Christian Hospital, Gwangju, Korea
5. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, St. Vincent’s Hospital, College of Medicine, Catholic University of Korea, Seoul, Korea
7. Department of Internal Medicine, Uijeongbu Eulji Medical Center, Eulji University School of Medicine, Uijeongbu, Korea
8. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea
9. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea
10. Department of Internal Medicine, Soonchunhyang University School of Medicine, Bucheon, Korea
11. Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
12. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
13. Department of Internal Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
14. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
15. Department of Internal Medicine, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea
16. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
17. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
18. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
19. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea