Etiology of 'Sinus Headache'-Moving the Focus from Rhinology to Neurology. A Systematic Review.

Brain Sci · 2021 · PMC7827425 · PMID 33435283

Europe PMC DOI

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might be significantno p-value reported

The reason for such a small prevalence of migraine is unclear, although the lack of headache specialist evaluation might be significant.

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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.