Using epidemiologic methods to evaluate out-of-hospital care: the ecologic study.
Maio
R F
RF
Department of Surgery, University of Michigan, Ann Arbor, USA.
Spaite
D
D
D000063:Accidents, Traffic / Q000401:mortality; D000367:Age Factors; D004463:Ecology; D004632:Emergency Medical Services; D004812:Epidemiologic Methods; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D008824:Michigan; D012107:Research Design