[1] Kosin Univ, Dept Internal Med, Coll Med, Div Rheumatol, Busan, South Korea
[2] Natl Univ Hosp, Div Rheumatol, Dept Internal Med, Busan, South Korea
[3] Pusan Natl Univ Hosp, Div Rheumatol, Dept Internal Med, Busan, South Korea
[4] Busan St Marys Hosp, Div Rheumatol, Dept Internal Med, Busan, South Korea
[5] Inje Univ, Div Rheumatol, Dept Internal Med, Coll Med, Busan, South Korea