[1] Harvard Med Sch, Brigham & Womens Hosp, Dept Anesthesiol Perioperat & Pain Med, Boston, MA 02115 USA
[2] Harvard Med Sch, Brigham & Womens Hosp, Ctr Surg & Publ Hlth, Boston, MA USA
[3] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Med, Div Gerontol, Boston, MA USA
[4] Univ Toronto, Hosp Sick Children, Dept Anesthesiol & Pain Med, Toronto, ON, Canada
[5] Harvard Med Sch, Dept Psychosocial Oncol & Palliat Care, Dana Farber Canc Inst, Boston, MA USA
[6] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Div Palliat Med, Boston, MA USA
[7] Harvard Med Sch, Brigham & Womens Hosp, Dept Surg, Boston, MA USA