[1] Univ Penn, Philadelphia Vet Affairs Med Ctr, Robert Wood Johnson Fdn Clin Scholars, Philadelphia, PA 19104 USA
[2] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
[3] Mathematica Policy Res Inc, Ann Arbor, MI USA
[4] Univ Michigan, Sch Publ Hlth, Dept Hlth Management & Policy, Ann Arbor, MI 48109 USA
[5] Univ Penn, Sch Med, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[6] Univ Penn, Sch Med, Abramson Canc Ctr, Philadelphia, PA 19104 USA
[7] Univ Penn, Sch Med, Div Gen Internal Med, Philadelphia, PA 19104 USA