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OnabotulinumtoxinA in the treatment of refractory chronic cluster headache.

J Headache Pain · 2018 · PMC6006000 · PMID 29915913

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showed a trendno p-value reported
Headache disability scores showed a trend to improvement after BoNT-A.

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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.