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Lexis diagram of the delayed temporary catch-up program for human papillomavirus vaccination. Gray boxes designate the current strategy of vaccinating incoming cohorts of 12-year-old girls (initiated in 2009). Blue boxes signify the proposed delayed, 1-year catch-up vaccination of females aged 18–20 years (dark blue) or 22, 24, or 26 years (lightest blue) in 2014.
