[1] Harvard Univ, Dana Farber Canc Inst, Dept Med Oncol, Sch Med, Boston, MA 02215 USA
[2] Harvard Univ, Dept Hlth Care Policy, Sch Med, Boston, MA 02215 USA
[3] Brigham & Womens Hosp, Div Gen Med, Boston, MA 02115 USA
[4] Univ Michigan, Inst Healthcare Policy & Innovat, Div Gen Med, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Sch Publ Hlth, Dept Hlth Management & Policy, Ann Arbor, MI 48109 USA
[6] Univ Michigan, Gerald R Ford Sch Publ Policy, Ann Arbor, MI 48109 USA
[7] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[8] RAND Corp, Santa Monica, CA USA
[9] Univ Calif Los Angeles, Div Gen Internal Med, Los Angeles, CA USA
[10] Univ Calif San Francisco, Dept Med, Div Geriatr, San Francisco, CA USA
[11] Inst Clin Evaluat Sci, Toronto, ON, Canada