[1] Univ Pittsburgh, Dept Hlth Policy & Management, Pittsburgh, PA USA
[2] Univ Pittsburgh, Sch Med, Dept Biomed Informat, Pittsburgh, PA USA
[3] Univ Pittsburgh, Med Ctr, Dept Med, Med Educ, Pittsburgh, PA USA
[4] Univ Pittsburgh, Div Geriatr Med, Dept Med, 3471 5th Ave,Suite 500,Kaufmann Med Bldg, Pittsburgh, PA 15213 USA
[5] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA