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