Acupuncture for postherpetic neuralgia: a systematic review protocol.

BMJ Open · 2014 · PMC4244400 · PMID 25392023

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may be significantno p-value reported

Specifically, there may be significant heterogeneity in the forms of acupuncture therapies used and the qualities of methodology.

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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.