A warning from the head of a prominent cancer research institute has rekindled fears about the possible health risks associated with extensive cell-phone use, especially among children--and it comes as a growing number of children are using cell phones to communicate.

Dr. Ronald B. Herberman, director of the University of Pittsburgh Cancer Institute, issued an unprecedented warning to his faculty and staff on July 23: Limit cell-phone use because of the possible risk of cancer.

Herberman's warning is contrary to numerous studies that don't find a link between cancer and cell-phone use, as well as a public lack of worry by the


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