Could you elaborate?
Sure. I am not an MD, but this is my view as an outsider: the medical profession is quite conservative, and people that publish medical papers have an incentive to publish "fast and loose," and not necessarily be very careful (because hey you can just write another paper later if a better method comes along!)
Because medicine deals with people, you often can't do random treatment assignment in your studies (for ethical reasons), so you often have evidence in the form of observational data, where you have a ton of confounding of various types. ...
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