[1] Kangwon Natl Univ, Sch Med, Dept Internal Med, Div Cardiol,Coll Med, 156 Baengnyeong Rd, Chunchon 24289, Gangwon, South Korea
[2] Yonsei Univ, Coll Med, Severance Cardiovasc Hosp, Div Cardiol, 50-1 Yonsei Ro, Seoul 03722, South Korea
[3] Korea Univ, Anam Hosp, Div Cardiol, Seoul, South Korea
[4] Chungnam Natl Univ Hosp, Dept Internal Med, Div Cardiol, Sejong, South Korea
[5] Univ Ulsan, Asan Med Ctr, Dept Internal Med, Div Cardiol,Coll Med, Seoul, South Korea
[6] Wonju Severance Christian Hosp, Dept Internal Med, Div Cardiol, Wonju, South Korea
[7] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Div Cardiol, Seongnam, South Korea
[8] Korea Univ, Guro Hosp, Cardiovasc Ctr, Seoul, South Korea
[9] Yonsei Univ, Gangnam Severance Hosp, Dept Internal Med, Cardiol Div,Coll Med, Seoul, South Korea
[10] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Cardiol,Dept Med, Seoul, South Korea