Handheld Cellular Telephone Use and Risk of Brain Cancer

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Abstract
Since the introduction of cellular telephone service in the United States in 1984,1 the number of subscribers has increased substantially every year. By the end of 1999, there were more than 86 million cellular telephone users.2 Cellular telephones, which include handheld or mobile telephones, car telephones, and portable or bag telephones, operate on radiofrequency (RF) signals in the 800- to 900-MHz range.