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Study Links Mobile Phones, Benign Tumors STOCKHOLM, Sweden - A Swedish study suggests that people who use a cell phone for at least 10 years might increase their risk of developing a rare benign tumor along a nerve on the side of the head where they hold the phone.    In an interview Thursday with The Associated Press, one of the researchers behind the preliminary study, Anders Ahlbom, said the results were surprising and more research is needed... 