1. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Internal Medicine, Eulji University School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
5. Department of Internal Medicine, Ewha Womans University College of Medicine, Korea.
6. Department of Internal Medicine, Korea University Guro Hospital, Korea.
7. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.