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D003625:Data Collection; D004181:Directories as Topic; D004631:Emergency Medical Service Communication Systems / Q000706:statistics & numerical data; D004632:Emergency Medical Services / Q000706:statistics & numerical data* / Q000639:trends; D005249:Fees and Charges / Q000706:statistics & numerical data; D008020:Life Support Care / Q000639:trends; D013677:Medical Laboratory Science / Q000639:trends; D011785:Quality Assurance, Health Care / Q000639:trends; D014481:United States; D014504:Urban Health / Q000706:statistics & numerical data* / Q000639:trends