[1] Univ Calif Davis, Dept Dermatol, Sacramento, CA 95816 USA
[2] Vet Affairs Northern Calif Hlth Care Syst, Dept Dermatol, Sacramento, CA 95655 USA
[3] Stanford Univ, Div Rheumatol & Immunol, Dept Internal Med & Dermatol, Palo Alto, CA 94305 USA
[4] Palo Alto VA Hosp, Palo Alto, CA 94305 USA
[5] Stanford Univ, Dept Dermatol, Redwood City, CA 94305 USA
[6] Paris Descartes Univ, Dept Rheumatol, Paris, France
[7] Univ Florence, Dept Rheumatol, Florence, Italy
[8] Lund Univ, Dept Rheumatol, Lund, Sweden
[9] Johns Hopkins Univ, Dept Med Rheumatol, Baltimore, MD 21287 USA
[10] Univ Toledo, Div Rheumatol, Dept Internal Med, Toledo, OH 43614 USA
[11] Univ E Anglia, Dept Rheumatol, Norwich NR4 7TJ, Norfolk, England
[12] Univ Florence, Dept Med & Rheumatol, Florence, Italy
[13] Univ Texas Houston, Div Rheumatol & Clin Immunogenet, Dept Internal Med, Houston, TX 77030 USA
[14] Univ Calif Davis, Div Rheumatol, Dept Internal Med, Davis, CA 95616 USA