Evidence in Orthodontics related to qualitative research.

Dental Press J Orthod · 2018 · PMC6150700 · PMID 30304155

Europe PMC DOI

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showed a trendno p-value reported

Results: The 27 articles selected showed a trend to increase in publications, with the most recent four years concentrating almost 60% of them.

also in 53,322 other papers

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.