The impact of non-financial and financial encouragements on participation in non school-based human papillomavirus vaccination: a retrospective cohort study

Objective Adolescent vaccination coverage under a system of non school-based vaccination is likely to be suboptimal, but might be increased by targeted encouragement campaigns. We analysed the effect on human papillomavirus (HPV) vaccination initiation by girls aged 12–18 of two campaigns set up in Flanders (Belgium) in 2007 and 2009: a personal information campaign and a combined personal information and financial incentive campaign.