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David F. Poltrack was incorrectly identified on the cover of Advertising Age (Nov. 13) as NBC's research chief. Mr. Poltrack is chief research officer of CBS Corp. and president of CBS Vision, and was identified as such in the Viewpoint piece he authored, "Why TV Needs Commercial Ratings-Now" (AA, Nov. 13, P. 22). Ad Age sincerely regrets the error.
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