title: Out-of-hospital clinical trials: challenges in advancing the evidence base.
authors.affiliation: Department of Emergency Medicine, University of Alabama at Birmingham, Birmingham, AL, USA. hwang@uabmc.edu
authors.forename: Henry E
authors.initials: HE
authors.lastname: Wang
authors.forename: Donald M
authors.initials: DM
authors.lastname: Yealy
mesh_terms: D004632:Emergency Medical Services; D006801:Humans; D007442:Intubation, Intratracheal; D016032:Randomized Controlled Trials as Topic / Q000379:methods / Q000592:standards