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Previous Volume 344:1331-1332 April 26, 2001 Number 17 Next

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To the Editor: The article by Inskip et al. (Jan. 11 issue)¹ provides reassuring findings that cellular-telephone use is not associated with an increased risk of brain tumors, but the study has some limitations that are due to its retrospective design. Exposure was assessed by interviews, and recall bias, one of the main pitfalls in case–control studies, may be a problem because patients with brain tumors can have impaired memory.

Since telephone companies keep very accurate records of the calls of their customers, it would have been possible to document cellular-telephone use objectively if these data were accessible. Although legal . . . [Full Text of this Article]

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