1. Department of Internal Medicine, St. Vincent's Hospital, The Catholic University of Korea School of Medicine, Suwon, Korea.
2. Department of Pathology, St. Vincent's Hospital, The Catholic University of Korea School of Medicine, Suwon, Korea.
3. Department of Pathology, Seoul St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.