1. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Seoul St. Mary's Hospital, The Catholic University of Korea; Seoul South Korea
2. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; St. Paul's Hospital, The Catholic University of Korea; Seoul South Korea
3. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Daejeon St. Mary's Hospital, The Catholic University of Korea; Daejeon South Korea
4. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Uijeongbu St. Mary's Hospital, The Catholic University of Korea; Uijeongbu South Korea
5. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Yeouido St. Mary's Hospital, The Catholic University of Korea; Seoul South Korea
6. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Bucheon St. Mary's Hospital, The Catholic University of Korea; Bucheon South Korea
7. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; St. Vincent's Hospital, The Catholic University of Korea; Suwon South Korea
8. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Incheon St. Mary's Hospital, The Catholic University of Korea; Incheon South Korea
9. Department of Internal Medicine, Cardiovascular Center and Cardiology Division; Chonnam National University Hospital, Chonnam National University; Gwangju South Korea