1. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Korea.
3. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Wonkwang University Sanbon Hospital, Gunpo, Korea.
5. Department of Internal Medicine, Gyeongsang National University School of Medicine, Jinju, Korea.
6. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea.
7. Department of Internal Medicine, Eulji University, Seoul, Korea.
8. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
9. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
10. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
11. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.