1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
3. Department of Surgery, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
4. Department of Pathology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
5. Department of Radiology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.