Emergency medical services: the research gaps.
D000063:Accidents, Traffic; D002649:Child Abuse; D003431:Cross-Cultural Comparison; D004332:Drowning; D004632:Emergency Medical Services / Q000706:statistics & numerical data; D004812:Epidemiologic Methods; D005069:Evaluation Studies as Topic; D005380:Financing, Government; D006801:Humans; D012106:Research; D012109:Research Support as Topic; D013405:Suicide; D014481:United States