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D003752:Dental Health Services / Q000706:statistics & numerical data; D003815:Dentists / Q000706:statistics & numerical data* / Q000600:supply & distribution; D006297:Health Services Accessibility / Q000706:statistics & numerical data; D006301:Health Services Needs and Demand / Q000706:statistics & numerical data; D006801:Humans; D009909:Oral Health; D014481:United States