[1] Kaiser Permanente Div Res, Oakland, CA USA
[2] Kaiser Permanente CREST Network, Oakland, CA USA
[3] Kaiser Permanente Vallejo Med Ctr, Dept Emergency Med, Vallejo, CA USA
[4] Vanderbilt Univ, Med Ctr, Dept Emergency Med, Nashville, TN USA
[5] Leiden Univ, Med Ctr, Dept Med Thrombosis & Hemostasis, Leiden, Netherlands
[6] UMass Chan Med Sch Baystate, Dept Emergency Med, Springfield, MA USA
[7] UMASS Chan Med Sch Baystate, Dept Healthcare Delivery & Populat Sci, Springfield, MA USA
[8] Kaiser Permanente Roseville Med Ctr, Dept Emergency Med, Roseville, CA USA
[9] Harvard Med Sch, Dept Emergency Med, Boston, MA USA
[10] Kaiser Permanente Div Res, 2000 Broadway, Oakland, CA 94612 USA