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