Sleep as a predictive factor for the onset and resolution of multi-site pain: a 5-year prospective study.

Eur J Pain · 2015 · PMC4359680 · PMID 25055982

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a clear trendno p-value reported

Even though our study indicates a clear trend, some caution has to be observed in interpreting the results.

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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.