Diagnostic and Prognostic Value of Circulating Tumor Cells in Head and Neck Squamous Cell Carcinoma: a systematic review and meta-analysis.

Sci Rep · 2016 · PMC4735798 · PMID 26831813

Europe PMC DOI

hedged sentence

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an obvious trendno p-value reported

The association between the presence of CTC and clinical features of patients were assessed by visual inspection because of unreported values and/or an obvious trend.

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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.