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Time to clearance (non-parametric Turnbull estimator) of incident infections and prevalent infections in women under 30 years of age, by HPV risk class, in NHS, ALTS, and CVT. Follow-up was truncated at 4 years in the figure, by which point nearly all infections had cleared. HPV68 was excluded from the analysis, as the SPF10-LiPA assay used in the CVT cannot distinguish HPV68 and non-carcinogenic HPV73.
