Prevalence of restless legs syndrome in migraine patients with and without aura: a cross-sectional, case-controlled study.

J Headache Pain · 2016 · PMC5074935 · PMID 27770406

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may be significantno p-value reported

The reported associations between smoking/caffeine consumption and higher migraine frequency support the notion that both smoking and caffeine consumption may be significant triggers of migraine attacks [ 42 ].

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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.