The ecology of medical care: origins and implications for population-based healthcare research.
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D000328:Adult; D003695:Delivery of Health Care / Q000266:history / Q000706:statistics & numerical data; D006302:Health Services Research / Q000266:history* / Q000379:methods; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D014481:United States