A study of more than 2.8 million Danish adults found that those who had been using mobile phones for 11 to 15 years didn't have an increased risk of acoustic neuromas -- noncancerous, slow-growing brain tumors -- compared with newer users and nonusers. Long-term cellphone users also didn't exhibit larger-than-expected tumors, noted the lead researcher of the study, which appears in the American Journal of Epidemiology.

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