[1] Univ Maryland, Med Ctr, R Adams Cowley Shock Trauma Ctr, 22 South Greene St, Baltimore, MD 21201 USA
[2] Johns Hopkins Univ, Sch Med, Div Infect Dis, Dept Med, Halsted 831,600 N Wolfe St, Baltimore, MD 21287 USA
[3] Univ Maryland, Sch Med, Dept Epidemiol & Publ Hlth, 685 W Baltimore MSTF, Baltimore, MD 21201 USA
[4] Washington Univ, Sch Med, Div Infect Dis, 660 S Euclid Ave,Campus Box 8051, St Louis, MO 63110 USA
[5] Washington Univ, Sch Med, Div Emergency Med, 660 S Euclid Ave,Campus Box 8051, St Louis, MO 63110 USA