Non-pharmacological therapies for postviral syndromes, including Long COVID: a systematic review and meta-analysis protocol.

BMJ Open · 2022 · PMC9002258 · PMID 35410933

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likely to be significantno p-value reported

There is likely to be significant methodological heterogeneity in clinical trials of non-pharmacological interventions for postviral syndromes, which may limit our ability to pool treatment effects.

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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.