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The good news is that the two studies referenced are high quality, large scale studies. Admittedly one of them does not specify the dosage of coffee involved (for the other, 3-4 250ml cups a day seems to be it), and that same first study did not seem to control for many other lifestyle contributors - could the coffee drinkers have been more health-conscious in other aspects of their life, for example.
You can read an excellent summary of the details of the studies and find links to read the original studies if you wish at the Skeptical Raptor website.
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