Charities or businesses?  American hospitals in the twentieth century.
Ludmerer
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KM
Stevens
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D004470:Economics, Medical / Q000266:history*; D006663:Historiography; D006666:History of Medicine; D049711:History, Modern 1601-; D006761:Hospitals / Q000266:history*; D012946:Social Welfare / Q000266:history*; D014481:United States