1 Division of Cardiology, Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2 Division of Cardiology, Cardiovascular Center, Keimyung University Dongsan Hospital, Daegu, Korea. kimic@dsmc.or.kr.
3 Division of Cardiothoracic surgery, Cardiovascular Center, Keimyung University Dongsan Hospital, Daegu, Korea.
4 Division of Cardiology, Cardiovascular Center, Keimyung University Dongsan Hospital, Daegu, Korea.