[1] Univ Pittsburgh, Med, Pittsburgh, PA USA
[2] VA Ctr Hlth Equity Res & Promot, Pittsburgh, PA USA
[3] VA Palo Alto Hlth Care Syst, Palo Alto, CA USA
[4] Univ Penn, Perelman Sch Med, Med Eth & Hlth Policy, Philadelphia, PA 19104 USA
[5] Univ Penn, Perelman Sch Med, Div Gen Internal Med, Philadelphia, PA 19104 USA
[6] Univ Pittsburgh, Med Ctr, Gen Internal Med, Pittsburgh, PA USA
[7] VA Pittsburgh Healthcare Syst, Res, Pittsburgh, PA USA
[8] Univ North Carolina Syst, Chapel Hill, NC USA