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Cumulative incidence by age of genital human papillomavirus (HPV) with number of men at risk at each 6-month study visit. A, Men having sex with men (MSM): HPV 16. B, Men having sex with women (MSW): HPV 16. C, MSM: HPV 6. D, MSW: HPV 6. Values on the x-axis denote months of follow-up. Abbreviation: CI, confidence interval.
