Hospital helicopter accidents: can they be prevented?
D000056:Accident Prevention; D000062:Accidents, Occupational / Q000517:prevention & control*; D000401:Aircraft / Q000592:standards*; D000552:Ambulances / Q000592:standards*; D004636:Emergency Service, Hospital / Q000592:standards*; D006801:Humans; D012449:Safety; D012637:Security Measures; D014481:United States