[1] Brigham & Womens Hosp, Dana Farber Canc Inst, Dept Med, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, Dana Farber Canc Inst, Dept Palliat Care, Boston, MA 02115 USA
[3] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Boston, MA USA
[4] Univ British Columbia, St Pauls Hosp, Div Gen Internal Med, Vancouver, BC V5Z 1M9, Canada
[5] Brown Univ, Dept Educ, Providence, RI 02912 USA
[6] New England Res Inst, Survey Res Ctr, Watertown, MA 02172 USA
[7] Boston Univ, Sch Med, Boston, MA 02118 USA
[8] Indiana Univ, Sch Med, Regenstrief Inst, Indianapolis, IN USA