SAN FRANCISCO -- A study of almost 200,000 workers for Motorola Corp. from a 20-year period concluded that there is not "a significant association" between occupational radiofrequency (RF) exposure and brain cancer, lymphoma or leukemia.The study was commissioned by the company and conducted by Exponent, Inc., of Menlo Park, which investigated the potential major health effects of workers exposed to RF from cellular phones, paging systems, two-way radios and microwave communication systems.Results o
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