[1] Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA USA
[2] Harvard Med Sch, Off Med Educ, Boston, MA USA
[3] Beth Israel Deaconess Med Ctr, Dept Emergency Med, Boston, MA USA
[4] Brigham & Womens Hosp, Dept Emergency Med, Boston, MA USA
[5] Massachusetts Gen Hosp, Dept Med, Boston, MA USA
[6] Massachusetts Gen Hosp, Dept Emergency Med, Zero Emerson Pl,Suite 3B, Boston, MA 02114 USA