[1] Seoul Natl Univ Hosp, Div Rheumatol, Dept Internal Med, Seoul, South Korea
[2] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Div Rheumatol, Seongnam, South Korea
[3] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[4] Seoul Natl Univ, Coll Med, Internal Med, Seoul, South Korea