Two papers have been published online in Occupational and Environmental Medicine. They show for the first time that there is a dose response effect for the risk of brain tumours among the heaviest users of mobile phones. Before this study, there was only an indication of an increased risk, but with no correlation with length of exposure, which could have been due to bias. The research also shows that the risk is confined to the most exposed part of the brain among long term users of mobile phones... 
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