[1] RAND Corp, 1200 S Hayes St, Arlington, VA USA
[2] Univ Calif Los Angeles, Fielding Sch Publ Hlth, Dept Canc Prevent & Control Res, BOX 956900,A2-125 CHS, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, Fielding Sch Publ Hlth, JCCC, BOX 956900,A2-125 CHS, Los Angeles, CA 90095 USA
[4] Univ Calif San Francisco, Div Gen Internal Med, 1545 Divisadero St, San Francisco, CA 94115 USA
[5] Northwestern Univ, Feinberg Sch Med, Dept Gen Internal Med, 750 N Lake Shore Dr,10th Floor, Chicago, IL 60611 USA
[6] Univ Calif San Francisco, Div Gen Internal Med, 1545 Divisadero St,Suite 311, San Francisco, CA 94115 USA