study The Physicians Health Study involved 22 071 male physicians Based on random selections 11 037 of them were treated with

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study The Physicians Health Study involved 22 071 male physicians Based on random selections 11 037 of them were treated with aspirin and the other 11 034 were given placebos The study was stopped early because it became clear that aspirin reduced the risk of myocardial infarctions by a substantial amount This is an experiment because the researchers observational study the individuals

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