Article in the Telegraph
"Ronald Herberman, the University of Pittsburgh Cancer Institute director, issued the warning as he urged mobile users to protect themselves from cancer risks.
Dr Herberman made the pronouncement in an internal memo to thousands of staff saying it was based on early unpublished data on the possible risk of brain cancer.
"We shouldn't wait for a definitive study to come out, but err on the side of being safe rather than sorry later," Dr Herberman said.
"I am convinced that there are sufficient data to warrant issuing an advisory to share some precautionary advice on cell phone use."
His warning came even though no major academic study has yet found any evidence that exposure to mobile phone signals affects brain function and the US Food and Drug Administration has said that, if there is a risk, it is probably very small.
Dr Heberman, however, said there was a "growing body of literature" which linked long-term mobile phone use with adverse health effects, including cancer."