[1] Univ Calif San Francisco, San Francisco Gen Hosp, Dept Family & Community Med, San Francisco, CA 94110 USA
[2] Univ Calif San Francisco, Dept Family & Community Med, San Francisco, CA 94110 USA
[3] Univ Calif San Francisco, Med Effectiveness Res Ctr Diverse Populat, San Francisco, CA 94110 USA
[4] Univ British Columbia, Sch Nursing, Vancouver, BC V5Z 1M9, Canada
[5] San Francisco Gen Hosp, Dept Med, Div Gen Internal Med, San Francisco, CA 94110 USA
[6] Kaiser Permanente, Div Res, Oakland, CA USA