[1] Chonnam Natl Univ, Chonnam Natl Univ Hosp, Dept Cardiovasc Med, Sch Med, Gwangju, South Korea
[2] Korea Univ, Anam Hosp, Dept Internal Med, Div Cardiol,Coll Med, Seoul, South Korea
[3] Catholic Univ Korea, Seoul St Marys Hosp, Catholic Res Inst Intractable Cardiovasc Dis, Coll Med,Dept Internal Med,Div Cardiol, Seoul, South Korea
[4] Sungkyunkwan Univ, Heart Vasc Stroke Inst, Samsung Med Ctr, Dept Med,Sch Med,Div Cardiol, Seoul, South Korea
[5] Eulji Univ, Nowon Eulji Med Ctr, Dept Cardiol, Seoul, South Korea
[6] Univ Ulsan, Asan Med Ctr, Dept Internal Med, Div Cardiol,Coll Med, Seoul, South Korea
[7] Korea Univ, Coll Med, Dept Internal Med, Div Endocrinol & Metab,Anam Hosp, Seoul, South Korea
[8] Seoul Natl Univ Hosp, Dept Internal Med, Seoul, South Korea
[9] Gachon Univ, Gil Med Ctr, Dept Internal Med, Div Cardiol,Coll Med, Incheon, South Korea
[10] Yonsei Univ, Dept Internal Med, Div Cardiol, Wonju Coll Med, Wonju, South Korea
[11] Yonsei Univ, Severance Hosp, Dept Internal Med, Div Cardiol,Coll Med, 50-1 Yonsei Ro, Seoul 03722, South Korea