[1] Northwestern Feinberg Sch Med, Dept Surg, Div Trauma & Crit Care Surg, Chicago, IL USA
[2] Northwestern Feinberg Sch Med, Ctr Healthcare Studies, Chicago, IL USA
[3] Northwestern Feinberg Sch Med, Dept Emergency Med, Chicago, IL USA
[4] Northwestern Feinberg Sch Med, Galter Hlth Sci Lib, Chicago, IL USA
[5] SUNY, Downstate Sch Med, Dept Emergency Med, New York, NY USA