Figure 3. Estimated age-standardized incidence of human papillomavirus (HPV)–positive and HPV-negative tonsillar cancer squamous cell carcinoma cases per 100,000 person-years, Stockholm, Sweden, 1970–2006. Error bars indicate 95% confidence intervals. Data from Näsman et al. (13), with permission of John Wiley and Sons (www.interscience.wiley.com).
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