[1] New Mexico State Univ, Dept Econ Appl Stat & Int Business, Las Cruces, NM USA
[2] Univ Calif San Francisco, Dept Med, Div Gen Internal Med, 1545 Divisadero St,Ste 309, San Francisco 94143, CA USA
[3] Univ Calif Davis, Davis, CA USA
[4] Kaiser Permanente Washington Hlth Res Inst, Seattle, WA USA
[5] Univ Vermont, Dept Surg, Canc Ctr, Burlington, VT USA
[6] Univ Vermont, Canc Ctr, Dept Radiol, Burlington, VT USA
[7] Univ N Carolina, Dept Radiol, Chapel Hill, NC USA
[8] Univ Calif San Francisco, Dept Vet Affairs, Gen Internal Med Sect, San Francisco, CA USA
[9] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[10] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA USA