Medical research in the twentieth century mostly takes place in the lab in the Renaissance though researchers went first and foremost to the library to see what the ancients had said.
Was this an old disease and if so which one? If it was new what did that say about the state of medical knowledge? And in any case how could physicians make sense of it?
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The sort of thinking at the time was 'Well we're giving you access to medical care which you wouldn't otherwise be able to get so your payment is that we get to use you in research.'