1. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
3. Department of Internal Medicine, Gangnam Severance Hospital, Seoul, Korea
4. Department of Internal Medicine, Konkuk University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, College of Medicine, Kyung Hee University, Seoul, Korea
6. Department of Internal Medicine, Keimyung University College of Medicine, Daegu, Korea
7. Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea
8. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
9. Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea
10. Department of Internal Medicine, Dong-A University Hospital, Dong-A University College of Medicine, Busan, Korea
11. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
12. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
13. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
14. Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Korea
15. Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
16. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea
17. Department of Internal Medicine, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea
18. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea