1 Division of Cardiology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2 Catholic Research Institute for Intractable Cardiovascular Disease (CRID), College of Medicine, The Catholic University of Korea, Seoul, Korea. jiheekim@catholic.ac.kr.
3 Department of Radiology, St. Vincent's Hospital, School of Medicine, The Catholic University of Korea, Suwon, Korea.