[1] Hanyang Univ Hosp Rheumat Dis, Seoul, South Korea
[2] Hanyang Univ Hosp Rheumat Dis, Rheumatol, Seoul, South Korea
[3] Hanyang Univ Hosp Rheumat Dis, CRCRA, Dept Rheumatol, Seoul, South Korea
[4] Catholic Univ Daegu, Sch Med, Med, Daegu, South Korea
[5] Dong A Univ Hosp, Rheumatol, Busan, South Korea
[6] Kyung Hee Univ, Med Ctr, Dept Rheumatol, 1 Hoeg, Seoul, South Korea
[7] Hallym Univ, Kangnam Sacred Heart Hosp, Internal Med, Seoul, South Korea
[8] Hanyang Univ Hosp Rheumat Dis, Dept Rheumatol, Seoul, South Korea
[9] Chonnam Natl Univ, Med Sch & Hosp, Chungnam, South Korea
[10] Hanyang Univ Hosp Rheumat Dis, Rheumatol, Seoul, South Korea
[11] Hanyang Univ Hosp Rheumat Dis, Dept Rheumatol, Seoul, South Korea
[12] Ewha Womans Univ, Sch Med, Int Med, Seoul, South Korea
[13] Chonnam Natl Univ, Med Sch & Hosp, Rheumatol, Gwangju, South Korea
[14] Hanyang Univ Hosp Rheumat Dis, Dept Internal Med, Div Rheumatol, Seoul, South Korea
[15] Inje Inivers, Ilsan Paik Hosp, Rheumatol Internal Med, Goyang, South Korea
[16] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Pulm & Crit Care Med, Seoul, South Korea
[17] CRCRA, Seoul, South Korea