By the numbers. Outsourcing.
D003625:Data Collection; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D019981:Health Care Sector / Q000145:classification / Q000706:statistics & numerical data; D006748:Hospital Departments / Q000145:classification / Q000458:organization & administration / Q000706:statistics & numerical data; D006801:Humans; D020416:Outsourced Services / Q000145:classification* / Q000706:statistics & numerical data; D014481:United States