[1] Ajou Univ, Sch Med, Dept Cardiol, Suwon 441749, South Korea
[2] Kwandong Univ, Coll Med, Cheil Gen Hosp, Dept Med Cardiol, Seoul, South Korea
[3] Seoul Natl Univ, Bundang Hosp, Ctr Cardiovasc, Songnam, South Korea
[4] Catholic Univ Korea, Coll Med, Ctr Cardiovasc, Seoul, South Korea
[5] Catholic Univ Korea, Coll Med, Div Cardiol, Seoul, South Korea
[6] Korea Univ, Guro Hosp, Ctr Cardiovasc, Seoul, South Korea
[7] Inha Univ, Coll Med, Dept Cardiol, Inchon, South Korea
[8] Chonnam Natl Univ Hosp, Ctr Heart, Div Cardiol, Kwangju, South Korea
[9] Chungbuk Natl Univ Hosp, Ctr Cardiovasc, Cheongju, South Korea
[10] Yonsei Univ, Coll Med, Div Cardiol, Seoul, South Korea
[11] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Cardiol, Seoul, South Korea
[12] Konyang Univ, Dept Cardiol, Taejon, South Korea