1. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea, Uijeongbu St. Mary's Hospital, Uijeongbu, Korea.
2. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea, Seoul St. Mary's Hospital, Seoul, Korea.
3. Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. CEWIT Center for Systems Biology, The State University of New York, Incheon, Korea.