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We conducted an extended follow-up study (March 2006–May 2008) to assess the longer term efficacy of a prophylactic monovalent human papillomavirus (HPV) type 16 L1 virus-like particle vaccine in women (n=290) who had enrolled in a randomized controlled trial of this vaccine (October 1998–November 1999) in Seattle and remained HPV-16 DNA negative during the course of that trial. During the extended...
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