[1] Yonsei Univ, Dept Prevent Med, Coll Med, Seoul, South Korea
[2] Catholic Univ Korea, Coll Med, Dept Internal Med, Seoul, South Korea
[3] Hanyang Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[4] Chonnam Natl Univ, Sch Med, Dept Internal Med, Gwangju, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Coll Med, Dept Internal Med, Seongnam, South Korea
[6] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[7] Kyungpook Natl Univ, Sch Med, Div Cardiol, Dept Internal Med, 130 Dongdeok Ro, Daegu 700721, South Korea
[8] Eulji Univ, Coll Med, Eulji Gen Hosp, Dept Neurol, Seoul, South Korea
[9] Yonsei Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[10] Ewha Womans Univ, Sch Med, Dept Internal Med, Seoul, South Korea