1. Department of Medical Education, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Ulsan University College of Medicine, Seoul, Korea.
4. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
5. Department of Surgery, Catholic University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Radiology, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Emergency Medicine, Yonsei University College of Medicine, Seoul, Korea.
9. Department of Radiology, Cha University School of Medicine, Seoul, Korea.