Using a mobile phone for extended periods is not linked with an increased risk of brain cancer, a study shows.

These are the findings from the COSMOS study, a large international project led by researchers at the Karolinska Institutet in Sweden and Imperial College London.

Starting in 2007, researchers studied more than 250,000 mobile phone users to investigate if extensive use of mobile phones increases the risk of brain tumours over time.

The phone users answered detailed questions about their mobile phone use, and were then followed in cancer registries to track the onset of any brain tumours.

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