[1] Soonchunhyang Univ, Coll Med, Dept Internal Med, Cheonan, South Korea
[2] Soonchunhyang Univ, Coll Med, Dept Internal Med, Div Rheumatol,Dept Rheumatol, Cheonan, South Korea
[3] Dankook Univ, Coll Med, Dept Internal Med, Cheonan, South Korea
[4] Konyang Univ Hosp, Dept Internal Med, Daejeon, South Korea
[5] Chungnam Natl Univ Hosp, Daejeon Rheumatoid & Degenerat Arthrit Ctr, Dept Internal Med, Div Rheumatol, Daejeon, South Korea
[6] Chungnam Natl Univ Hosp, Daejeon Rheumatoid & Degenerat Arthrit Ctr, Rheumatol, Daejeon, South Korea
[7] Chungbuk Natl Univ, Coll Med, Dept Internal Med, Cheongju, South Korea
[8] Kyung Hee Univ Hosp, Rheumatol, Seoul, South Korea
[9] Kyung Hee Univ Hosp, Dept Internal Med, Div Rheumatol, Seoul, South Korea
[10] Chungnam Natl Univ Hosp, Daejeon Rheumatoid & Degenerat Arthrit Ctr, Internal Med, Deajeon, South Korea