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Kaplan–Meier estimate of the cumulative incidence of oral human papillomavirus (HPV) infection, by baseline serostatus (for HPV-6, -11, -16, or -18), among men in the HPV Infection in Men Study (participants were recruited in Tampa, FL, Cuernavaca, Mexico, and São Paulo, Brazil). Because of small sample sizes, cumulative incidence curves were compared using a Cox P value derived from a Cox proportional hazards model.
