[1] Univ Texas MD Anderson Canc Ctr, Dept Symptom Res, Unit 1450, Houston, TX 77030 USA
[2] Univ Michigan, Dept Anesthesiol, Sch Med, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Hlth Management & Policy, Sch Med, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Dept Anesthesiol, Sch Publ Hlth, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Dept Hlth Management & Policy, Sch Publ Hlth, Ann Arbor, MI 48109 USA
[6] Duke Univ, Duke Inst Care End Life, Divin Sch, Durham, NC USA