[1] Catholic Univ Korea, Rheumatism Res Ctr RhRC, Seoul, South Korea
[2] Pusan Natl Univ, Coll Med, Dept Internal Med, Busan, South Korea
[3] Konkuk Univ, Sch Med, Dept Internal Med, Div Rheumatol, Seoul, South Korea
[4] Hallym Univ, Kang Nam Sacred Heart Hosp, Dept Internal Med, Div Rheumatol, Seoul, South Korea
[5] Inje Univ, Ilsan Paik Hosp, Dept Internal Med, Goyang, South Korea