1. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea.
3. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea.
5. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Ewha Womans Unniversity School of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
8. Department of Internal Medicine, Sungkyunkwan University, School of Medicine, Seoul, Korea.
9. Department of Internal Medicine, The Catholic University of Korea School of Medicine, Seoul, Korea.