200 city survey. EMS in the nation's most-populous cities.
Mayfield
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D003625:Data Collection; D004554:Electric Countershock; D004632:Emergency Medical Services / Q000706:statistics & numerical data; D004634:Emergency Medical Technicians / Q000592:standards; D019538:Health Care Surveys; D014481:United States; D019037:Urban Health Services; D014505:Urban Population