[1] Catholic Univ Korea, Coll Med, Dept Internal Med, Div Cardiol,Seoul St Marys Hosp, Seoul, South Korea
[2] Chonnam Natl Univ Hosp, Dept Cardiovasc Med, 42 Jebong Ro, Gwangju 61469, South Korea
[3] Catholic Univ Korea, Coll Med, Dept Internal Med, Div Cardiol,Uijeongbu St Marys Hosp, Seoul, South Korea
[4] Sungkyunkwan Univ, Samsung Med Ctr, Dept Internal Med, Div Cardiol,Sch Med, Seoul, South Korea
[5] Chosun Univ, Dept Internal Med, Coll Med, Gwangju, South Korea
[6] Keimyung Univ, Dept Internal Med, Div Cardiol, Dongsan Hosp, Daegu, South Korea
[7] Kyung Hee Univ, Kyung Hee Univ Hosp, Dept Internal Med, Div Cardiovasc, Seoul, South Korea
[8] Gyeongsang Natl Univ Hosp, Dept Internal Med, Div Cardiol, Jinju, South Korea
[9] Korea Univ, Dept Internal Med, Div Cardiol, Guro Hosp, Seoul, South Korea
[10] Seoul Natl Univ Hosp, Dept Internal Med, Div Cardiol, Seoul, South Korea
[11] Chungbuk Natl Univ Hosp, Dept Internal Med, Div Cardiol, Cheongju, South Korea
[12] Severance Hosp, Dept Internal Med, Div Cardiol, Seoul, South Korea