1Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
2Department of Cardiology, Seoul National University Hospital, Seoul, Korea.
3Department of Cardiology, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.
4Department of Cardiology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
5Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
6Department of Cardiology, Kyungpook National University Hospital, Daegu, Korea.
7Department of Cardiology, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
8Department of Cardiology, Pusan National University Hospital, Busan, Korea.
9Division of Cardiology, Yeungnam University Hospital, Daegu, Korea.
10Division of Cardiology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
11Department of Cardiology, Chunbuk National University Hospital, Jeonju, Korea.
12Department of Cardiology, Jeju National University Hospital, Jeju, Korea.
13Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
14Department of Cardiology, Keimyung University Dongsan Medical Center, Daegu, Korea.
15Department of Cardiology, Chungnam National University Hospital, Daejeon, Korea.
16Department of Cardiology, Chungbuk National University Hospital, Cheongju, Korea.
17Department of Cardiology, Inje University Haeundae Paik Hospital, Busan, Korea.
18Department of Cardiology, Wonkwang University Hospital, Iksan, Korea.
19Department of Cardiology, Gachon University Gil Medical Center, Incheon, Korea.
20Department of Cardiology, Kyungsang National University Hospital, Jinju, Korea.