It was based on previous research which suggested that exposure to radio-frequency electromagnetic radiation (RF-EMR) emitted by cellphones can have a detrimental effect on male fertility. Dr Mathews conducted a systematic review of the findings from 10 studies, including 1,492 samples, with the aim of clarifying the potential role of this environmental exposure. While the researchers found no association between regular mobile phone use and risk of the brain tumor (phoning at least once a week for six months or more), they did find an increased risk of common types of brain tumors with intensive mobile phone use (active calling for more than 15 hours per month).
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