[1] Kaiser Permanente No Calif, Div Res, Oakland, CA 94612 USA
[2] Univ Calif San Francisco, Dept Epidemiol, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Biostat, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA
[5] Tufts Sch Med, Dept Med, Boston, MA USA
[6] Univ Calif San Francisco, San Francisco Gen Hosp, Dept Med, Div Endocrinol, San Francisco, CA USA
[7] Univ Massachusetts, Sch Med, Fallon Clin Fdn, Meyers Primary Care Inst, Worcester, MA USA
[8] Fallon Community Hlth Plan, Worcester, MA USA