[1] Catholic Univ Korea, Coll Med, Incheon St Marys Hosp, Dept Internal Med, Inchon, South Korea
[2] Soonchunhyang Univ, Coll Med, Dept Internal Med, Bucheon, South Korea
[3] Catholic Univ Korea, Coll Med, Yeouido St Marys Hosp, Dept Internal Med, Seoul, South Korea
[4] Ewha Womans Univ, Sch Med, Ewha Med Res Inst, Dept Internal Med, Seoul, South Korea
[5] Yonsei Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[6] Hallym Univ, Coll Med, Dept Internal Med, Chunchon, South Korea
[7] Chonbuk Natl Univ, Sch Med, Dept Internal Med, Jeonju, South Korea
[8] Jeju Natl Univ, Sch Med, Dept Internal Med, Jeju, South Korea
[9] Inje Univ, Coll Med, Busan Paik Hosp, Dept Internal Med, Busan, South Korea