Excessive daytime sleepiness and metabolic syndrome in men with obstructive sleep apnea: a large cross-sectional study.

Oncotarget · 2017 · PMC5668082 · PMID 29108349

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may be significantno p-value reported

Last, selection bias may be significant, as we included subjects referred from our sleep center.

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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.