1. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.
3. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
4. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
5. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea.
7. Division of Infectious Diseases, Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
8. Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
9. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea.
10. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
11. Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.
12. Department of Internal Medicine, GangNeung Asan Hospital, Gangneung, Korea.
13. Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, Korea.
14. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea.