The influence of expectation on spinal manipulation induced hypoalgesia: an experimental study in normal subjects.

BMC Musculoskelet Disord · 2008 · PMC2270829 · PMID 18267029

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may be significantno p-value reported

The failure to account for non- specific effects may be significant as expectation has demonstrated a robust influence in the general pain literature [ 29 - 40 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.