[1] Catholic Univ Korea, Coll Med, Dept Internal Med, Div Rheumatol, Banpodaero 222, Seoul, South Korea
[2] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Internal Med,Div Rheumatol,Med, Seoul, South Korea
[3] Kangnam St Marys Hosp, Seoul, South Korea