1. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea.
2. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
3. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
4. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea.
5. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea.