Diagnostic lumbar puncture. Comparative study between 22-gauge pencil point and sharp bevel needle.

J Headache Pain · 2005 · PMC3452066 · PMID 16362713

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a slight trendno p-value reported

However, there was a slight trend suggest- ing atraumatic needle might cause headache and need for further therapy less frequently.

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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.