European Respiratory Society International Congress 2018: four shades of epidemiology and tobacco control.

ERJ Open Res · 2019 · PMC6397917 · PMID 30847352

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a decreasing trendno p-value reported

Nevertheless, recent population-based surveys among European countries reveal a decreasing trend of assisted quitting with the support of HCPs towards unassisted quitting or the use of e-cigarettes [ 50 ].

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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.