[1] Chung Ang Univ Hosp, Dept Internal Med, Seoul, South Korea
[2] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Internal Med, Seoul, South Korea
[3] Catholic Univ Korea, Daejeon St Marys Hosp, Dept Internal Med, Daejeon, South Korea
[4] Catholic Univ Korea, St Vincents Hosp, Coll Med, Dept Internal Med, Suwon, South Korea
[5] Korea Univ, Coll Med, Dept Internal Med, Ansan, South Korea
[6] Soonchunhyang Univ, Coll Med, Dept Internal Med, Cheonan, South Korea
[7] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Seongnam, South Korea
[8] Korea Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[9] Kyungpook Natl Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[10] Keimyung Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[11] Dongguk Univ, Ilsan Hosp, Dept Internal Med, Goyang, South Korea
[12] Chosun Univ, Coll Med, Dept Internal Med, Gwangju, South Korea
[13] Kyung Hee Univ, Sch Med, Dept Internal Med, Seoul, South Korea
[14] Chung Ang Univ, Gwangmyeong Hosp, Dept Internal Med, Gwangmyeong, South Korea