1. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
4. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
6. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea.
7. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
9. Department of Internal Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea.
10. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
11. Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Kyunghee University College of Medicine, Seoul, Korea.
13. Department of Radiology, Konkuk University School of Medicine, Seoul, Korea.