[1] VA Pittsburgh Healthcare Syst, Pittsburgh, PA USA
[2] Duke Univ, Med Ctr, Dept Biostat & Bioinformat, Durham, NC USA
[3] Univ Pittsburgh, Sch Med, Inst Enhance Palliat Care, Pittsburgh, PA USA
[4] Univ Pittsburgh, Sch Med, Inst Doctor Patient Commun, Pittsburgh, PA USA
[5] Univ Pittsburgh, Dept Med, Sch Med, Div Gen Internal Med, Pittsburgh, PA USA
[6] Duke Univ, Phys Assistant Program, Durham, NC USA
[7] Duke Univ, Med Ctr, Duke Comprehens Canc Ctr, Canc Prevent Detect & Control Res Program, Durham, NC 27710 USA
[8] Duke Univ, Med Ctr, Dept Community & Family Med, Durham, NC 27710 USA
[9] Durham VA Med Ctr, Ctr Hlth Serv Res, Durham, NC USA
[10] Duke Univ, Med Ctr, Ctr Palliat Care, Durham, NC USA
[11] Duke Univ, Med Ctr, Dept Med, Durham, NC 27710 USA