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To the Editor: In a previous report¹ on overall mortality for a cohort of 255,868 cellular telephone users from a single cellular carrier, we found that age-specific total mortality rates for users of handheld cellular telephones differed little from those of users of nonhandheld (car and bag) cellular telephones. Herein we report cause-specific mortality in 1994 for an expanded cohort. Although the initial protocol called for continuing surveillance for mortality,² access to data beyond 1 year was blocked by a class-action lawsuit³ challenging the legality of monitoring product safety through record linkage.

Methods

The cohort was compiled from 2 large US cellular telephone carriers serving several metropolitan areas. For each noncorporate customer we obtained, when available, name, address, date of birth, mobile telephone number, account number, electronic serial number, social security number, start of service date, number of minutes billed, and number of calls made and received in November and December . . . [Full Text of this Article]

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