[1] Univ Washington, Dept Med, Seattle, WA USA
[2] Univ Washington, UW Med Ctr Scholarship Patient Care Qual & Safety, Seattle, WA 98195 USA
[3] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
[4] Univ Penn, Dept Med Eth & Hlth Policy, Philadelphia, PA 19104 USA
[5] Philadelphia VA Med Ctr, Ctr Hlth Equity Res & Promot, Philadelphia, PA USA
[6] Univ Penn, Dept Med, Philadelphia, PA 19104 USA
[7] Amer Coll Physicians, Philadelphia, PA USA
[8] Univ Penn, Dept Biostat Epidemiol & Informat, Philadelphia, PA USA