1 Department of Internal Medicine, Catholic Medical Center, The Catholic University of Korea, Seoul, Korea.
2 Division of Cardiology, Department of Internal Medicine, Daejeon St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
3 Catholic Research Institute for Intractable Cardiovascular Disease (CRID), College of Medicine, The Catholic University of Korea, Seoul, Korea.
4 Catholic Research Institute for Intractable Cardiovascular Disease (CRID), College of Medicine, The Catholic University of Korea, Seoul, Korea. myunheelee@catholic.ac.kr.