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While mobile phone usage in the population increased from less than 15 % to 95 % over the time period studied, we do not see the same increase in malignant brain tumors. This suggests that the strength of any effect, if present, would have to be small, for now, linking a rise in malignant brain tumors to mobile phone usage remains speculative and should not detract from encouraging lifestyle changes which are known to reduce cancer risk, such as adopting a healthy diet, reducing alcohol consumption and stopping smoking.