Assertion: placebo's effect | /r/HasProperty | powerful clinical
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Source sentences:
text: Review of clinical trials with patients randomly assigned to either a placebo or no treatment showed small differences in clinical outcome, leading to the conclusion that there is little evidence to support the assertion that placebos have powerful clinical effects 36 .
text: It is generally accepted that placebos are associated with powerful nonspecific effects 3 , 25 - 29 .