[1] Yonsei Univ Wonju, Wonju Severance Christian Hosp, Coll Med, Dept Cardiol, Wonju, South Korea
[2] Yonsei Univ, Severance Cardiovasc Hosp, Coll Med, Div Cardiol, Seoul, South Korea
[3] Chungbuk Natl Univ Hosp, Div Cardiol, Cheongju, South Korea
[4] Seoul Natl Univ Hosp, Dept Internal Med, Seoul, South Korea
[5] Seoul Natl Univ Bundang Hosp, Dept Med, Div Cardiol, Gyeonggi, Seongnam, South Korea
[6] Sungkyunkwan Univ, Coll Med, Samsung Med Ctr, Dept Internal Med, Seoul, South Korea
[7] Yonsei Univ, Wonju Severance Christian Hosp, Wonju Coll Med, Dept Internal Med, 20 Ilsan Ro, Wonju 26426, South Korea