Use of the helicopter as an emergency vehicle in the civilian environment: results of a survey-questionnaire.
D000401:Aircraft; D000552:Ambulances / Q000706:statistics & numerical data; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D011795:Surveys and Questionnaires; D014187:Transportation of Patients / Q000706:statistics & numerical data*