[1] Univ Maryland, Dept Cell Biol & Mol Genet, College Pk, MD USA
[2] Univ Iowa, Carver Coll Med, Dept Emergency Med, Iowa City, IA USA
[3] Univ Maryland Lib, Res & Acad Serv, College Pk, MD USA
[4] Washington Univ, Sch Med, Dept Anesthesiol, Dept Emergency Med,Div Crit Care, St Louis, MO USA
[5] Univ Iowa, Carver Coll Med, Dept Emergency Med, 200 Hawkins Dr,1008 RCP, Iowa City, IA 52242 USA
[6] Univ Iowa, Carver Coll Med, Dept Anesthesia Crit Care, 200 Hawkins Dr,1008 RCP, Iowa City, IA 52242 USA
[7] Univ Iowa, Carver Coll Med, Dept Epidemiol, 200 Hawkins Dr,1008 RCP, Iowa City, IA 52242 USA