Increasing incidence of thyroid cancer in the Nordic countries with main focus on Swedish data.

BMC Cancer · 2016 · PMC4937579 · PMID 27388603

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an increasing trendno p-value reported

A case-control study from Kuwait showed a statistically significant dose response pattern with an increasing trend in risk for thyroid cancer with increasing numbers of dental x-rays.

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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.