Neuroimaging in cluster headache and other trigeminal autonomic cephalalgias.

J Headache Pain · 2012 · PMC3253152 · PMID 22116532

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a clear trendno p-value reported

Additionally, a clear trend of cingulate cortex, insula, temporal and frontal cortices activation was observed [ 46 ].

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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.