1. Division of Internal Medicine, Hangang Sacred Heart Hospital, Seoul, Korea.
2. Division of Internal Medicine, GangNam Sacred-heart Hospital, Seoul, Korea.
3. Division of Laboratory Medicine, Hangang Sacred Heart Hospital, Seoul, Korea.
4. Division of Radiology, Hangang Sacred Heart Hospital, Seoul, Korea.
5. Division of Pathology, Hangang Sacred Heart Hospital, Seoul, Korea.
6. Division of Internal Medicine, National Medical Center, Seoul, Korea.