The most recent study by the
World Heath Organization came to this conclusion:
http://well.blogs.nytimes.com/2010/0...-brain-tumors/
Quote:
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The final paper states that overall there is no link between cellphone use and brain tumors. However, the investigators report that study participants with the highest level of cellphone use had a 40 percent higher risk for a type of brain tumor called a glioma. That risk, though, is discounted because of potential “biases and errors” that “prevent a causal interpretation,” the investigators wrote.
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It should be noted that since that study, "CREAL is co-ordinating a new project, MobiKids, funded by the European Union, to investigate the risk of brain tumours from mobile phone use in childhood and adolescence."
But no conclusive evidence linking health problems to cellphones has yet been reached regarding that study, so no such valid claims can be made in this thread.