[1] Harvard Med Sch, Dept Emergency Med, Massachusetts Gen Hosp, Boston, MA 02115 USA
[2] Massachusetts Gen Hosp, Lawrence Ctr Qual & Safety, Boston, MA 02114 USA
[3] Brigham & Womens Hosp, Div Gen Internal Med & Primary Care, 75 Francis St, Boston, MA 02115 USA
[4] Harvard Med Sch, Boston, MA 02115 USA
[5] Harvard TH Chan Sch Publ Hlth, Dept Hlth Policy & Management, Boston, MA USA