[1] Seoul Natl Univ, Coll Med, Dept Internal Med, Div Cardiol, 101 Daehak Ro, Seoul 03080, South Korea
[2] Seoul Natl Univ Hosp, Healthcare Syst Gangnam Ctr, Seoul, South Korea
[3] Catholic Univ Korea, Coll Med, Dept Med Stat, Seoul, South Korea
[4] Seoul Natl Univ Hosp, Cardiovasc Ctr, Cardiovasc Imaging Sect, 101 Daehak Ro, Seoul 03080, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Cardiovasc Ctr, Dept Cardiol, Seongnam, Gyeonggi, South Korea
[6] Mayo Clin, Coll Med, Div Cardiovasc Dis, Rochester, MN USA