[1] Univ Chicago, MacLean Ctr Clin Med Eth, Dept Obstet & Gynecol & Med, Sect Geriatr & Palliat Med, Chicago, IL 60637 USA
[2] City Hope Natl Med Ctr, Dept Support Care Med, 1500 E Duarte Rd, Duarte, CA 91010 USA
[3] Univ Chicago, Dept Obstet & Gynecol, Chicago, IL 60637 USA
[4] Univ Michigan, Dept Internal Med, Inst Social Res, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Inst Gerontol, Ann Arbor, MI 48109 USA
[6] Vet Affairs Ctr Clin Management Res, Ann Arbor, MI USA
[7] Univ Chicago, Dept Publ Hlth Sci, Chicago, IL 60637 USA