[1] Catholic Univ Korea, Bucheon St Marys Hosp, Div Rheumatol, Dept Internal Med,Coll Med, Bucheon, South Korea
[2] SMG SNU Boramae Med Ctr, Div Rheumatol, Dept Internal Med, Kyungnam Villa 102, Seoul, South Korea
[3] Ajou Univ, Sch Med, Dept Rheumatol, Suwon, South Korea