Here's looking at vision care.
Lippman
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D003625:Data Collection; D006264:Health Benefit Plans, Employee / Q000706:statistics & numerical data / Q000639:trends*; D006801:Humans; D008329:Managed Care Programs / Q000706:statistics & numerical data / Q000639:trends*; D014481:United States; D014787:Vision Tests / Q000191:economics* / Q000706:statistics & numerical data