[1] Univ Colorado, Sch Med, Dept Med, Aurora, CO USA
[2] Duke Univ, Sch Med, Dept Populat Hlth Sci, Durham, NC USA
[3] Duke Canc Inst, Canc Prevent & Control, Durham, NC USA
[4] Natl Inst Nursing Res, Div Extramural Sci Programs, NIH, Bethesda, MD USA
[5] Massachusetts Gen Hosp, Dept Med, Boston, MA USA
[6] Massachusetts Gen Hosp, Ctr Aging & Serious Illness, Boston, MA USA
[7] Harvard Med Sch, Boston, MA USA
[8] Univ Colorado, Sch Med, Dept Med, Aurora, CO 80045 USA