[1] Univ Calif San Francisco, Sch Med, San Francisco, CA USA
[2] Univ Calif San Francisco, Dept Med, Div Rheumatol, San Francisco, CA USA
[3] Natl Human Genome Res Inst, NIH, Bethesda, MD USA
[4] CDCP, Div Populat Hlth, Atlanta, GA USA
[5] Univ Birmingham, Inst Inflammat & Ageing, Rheumatol Res Grp, Birmingham, England
[6] Univ Calif San Francisco, Inst Hlth Policy Studies, San Francisco, CA USA
[7] Univ Calif San Francisco, Dept Med, Div Rheumatol, San Francisco, CA 94143 USA