For men aged 60–69 years, only risk ratios exceeding 1.5 for 339 h of use, ≥2.0 for 558 h of use, and ≥2.5 for 896 h were incompatible with the observed incidence, while most of the lower RRs underestimated the observed incidence due to an increasing trend in the background rates.
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Time trends in mobile phone use and glioma incidence among males in the Nordic Countries, 1979-2016.
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