[1] Washington Univ, Sch Med, BJC HealthCare, Ctr Clin Excellence, St Louis, MO 63110 USA
[2] Washington Univ, Sch Med, Dept Med, St Louis, MO 63110 USA
[3] Rush Univ, Med Ctr, Dept Med, Chicago, IL 60612 USA
[4] Harvard Univ, Sch Med, Dept Populat Med, Boston, MA USA
[5] Harvard Pilgrim Hlth Care Inst, Boston, MA USA
[6] Brigham & Womens Hosp, Dept Med, Boston, MA 02115 USA
[7] NorthShore Univ HealthSyst, Dept Qual Control, Evanston, IL USA
[8] NorthShore Univ HealthSyst, Dept Infect Control, Evanston, IL USA
[9] Partners HealthCare, Partners eCare, Boston, MA USA
[10] Cook Cty Hlth & Hosp Syst, Dept Med, Chicago, IL USA