Antidepressant efficacy of agomelatine: meta-analysis of published and unpublished studies.

BMJ · 2014 · PMC3959623 · PMID 24647162

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likely to be significantno p-value reported

Lastly, a particular concern was the high level of heterogeneity observed for both placebo controlled and comparator controlled studies and our inability to identify variables likely to be significant contributors to this heterogeneity.

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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.