[1] Univ Pittsburgh, Med Ctr, Dept Med, Div Rheumatol, Pittsburgh, PA USA
[2] Univ Penn, Dept Dermatol, Philadelphia, PA USA
[3] Johns Hopkins Univ, Rheumatol, Baltimore, MD USA
[4] Seoul Natl Univ Hosp, Rheumatol, Seoul, South Korea
[5] IIID Murdoch Univ, Dept Neurol, Perth, WA, Australia
[6] Univ Notre Dame, Perth, WA, Australia
[7] Johns Hopkins Univ, Med Rheumatol, Baltimore, MD USA
[8] Univ Pittsburgh, Med Ctr, Dept Med, Pittburgh, PA 15260 USA