1. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Hallym University College of Medicine, Seoul, Korea.
3. Gachon University Gil Hospital Cancer Center, Incheon, Korea.
4. Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea.
5. Department of Pediatrics, Korea University College of Medicine, Ansan, Korea.
6. Department of Internal Medicine, Konkuk University College of Medicine, Chungju, Korea.
7. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
8. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
9. Department of Internal Medicine, Catholic University College of Medicine, Suwon, Korea.