By JENNIFER C. YATES and SETH BORENSTEIN
Associated Press Writers
AP Photo
This undated photo provided by the University of Pittsburg Medical Center shows Dr. Ronald B. Herberman, director of the University of Pittsburgh Cancer Institute in Pittsburgh, Pa. Herbermann issued an unprecedented warning to his faculty and staff Wednesday, July 23, 2008 that they should limit cell phone use because signs indicate a link with cancer. However, cancer experts and others say there still is no convincing evidence in this recurring controversial debate.
PITTSBURGH The head of a prominent cancer research institute issued an unprecedented warning to his faculty and staff Wednesday: Limit cell phone use because of the possible risk of cancer.







