A review of diagnostic and functional imaging in headache.

J Headache Pain · 2006 · PMC2780619 · PMID 16897620

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highly significantno p-value reported

This highly significant activation was not seen in cluster headache patients out of the bout when compared to the patients experiencing an acute cluster headache attack [ 75 ].

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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.