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![The word \](https://thumbs.dreamstime.com/m/d-rendering-flat-lay-composition-letter-tiles-spelling-out-word-homeopathy-numerous-other-white-scattered-364790853.jpg "The word \")
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| navigate by keyword : placebo effect treatment clinical study experiment control group response medicine psychology research trials drug intervention comparison randomized patients impact therapeutic efficacy perception doubleblind health outcome simulation psychological belief expectation rate mechanism neurobiology neuroscience illusion effectiveness analysis phenomenon positive behavioral physiological subjective observation placebocontrolled testing hypothesis assessment variable validation sensitivity |
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| placebo word block on white background |
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