[1] Univ Calif San Francisco, Dept Med, Div Endocrinol & Metab, San Francisco, CA 94143 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