[1] Catholic Univ Korea, Kangnam St Marys Hosp, Dept Internal Med, Div Rheumatol, Seoul, South Korea
[2] Catholic Univ Korea, Rheumatism Res Ctr, Seoul, South Korea
[3] Catholic Univ Korea, Kangnam St Marys Hosp, Rheumatism Res Ctr, Seoul, South Korea
[4] Catholic Univ Korea, Dept Internal Med, Div Rheumatol, Seoul, South Korea