1. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Hallym University College of Medicine, Anyang, Korea
3. Department of Internal Medicine, Kwangju Christian Hospital, Gwangju, Korea
4. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Department of Internal Medicine, Eulji University College of Medicine, Seoul, Korea
7. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Seoul National University Boramae Medical Center, 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, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
13. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea
14. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea
15. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
16. Department of Internal Medicine, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea