1. Department of Medicine, Graduate School, Yonsei University, Seoul, Korea.
2. Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Radiology, Yeouido St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
7. Department of Radiology, Seoul Veterans Hospital, Seoul, Korea.