title: The ecology of medical care revisited.
authors: Robert Graham Center, Washington, DC 20036, USA.
authors: L A
authors: LA
authors: Green
authors: G E
authors: GE
authors: Fryer
authors: B P
authors: BP
authors: Yawn
authors: D
authors: D
authors: Lanier
authors: S M
authors: SM
authors: Dovey
mesh_terms: D000328:Adult; D002648:Child; D003695:Delivery of Health Care / Q000458:organization & administration / Q000706:statistics & numerical data*; D005260:Female; D006296:Health Services / Q000706:statistics & numerical data*; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D009017:Morbidity; D009819:Office Visits / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology