[1] Univ Rochester, Div Hosp Med, Sch Med & Dent, Dept Med, Rochester, NY USA
[2] Corporal Cresencz VA Med Ctr, Ctr Hlth Equ Res & Promot, Philadelphia, PA USA
[3] Univ Penn, Perelman Sch Med, Div Gen Internal Med, Philadelphia, PA USA
[4] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA USA
[5] Univ Minnesota, Div Hosp Med, Dept Med, Med Sch, Minneapolis, MN USA
[6] Univ Minnesota, Div Pediat Hosp Med, Dept Pediat, Med Sch, Minneapolis, MN USA
[7] Div Hosp Med, Dept Med, 601 Elmwood Ave, Rochester, NY 14642 USA