[1] Univ Maryland, Dept Epidemiol & Publ Hlth, Sch Med, MSTF 334C,10 S Pine St, Baltimore, MD 21201 USA
[2] Univ Maryland, Dept Pharmaceut Hlth Serv Res, Sch Pharm, MSTF 334C,10 S Pine St, Baltimore, MD 21201 USA
[3] Univ Maryland, Med Ctr, R Adams Cowley Shock Trauma Ctr, Dept Surg,Div Surg Crit Care, MSTF 334C,10 S Pine St, Baltimore, MD 21201 USA
[4] Univ Maryland, Shock Trauma & Anesthesiol Res Organized Res Ctr, Natl Study Ctr Trauma & Emergency Med Serv, MSTF 334C,10 S Pine St, Baltimore, MD 21201 USA