Characteristics of the health services delivery system.
D000553:Ambulatory Care / Q000706:statistics & numerical data; D006296:Health Services / Q000706:statistics & numerical data / Q000600:supply & distribution*; D006280:Health Workforce / Q000600:supply & distribution*; D006764:Hospitals, Community / Q000706:statistics & numerical data; D013223:Statistics as Topic; D014481:United States