Letter to the Editor in response to Herweijer E., Sundström K., Ploner A., Uhnoo I., Sparén P. and Arnheim-Dahlström L. (2016), Quadrivalent HPV vaccine effectiveness against high-grade cervical lesions by age at vaccination: A population-based study. Int. J. Cancer, 138: 2867–2874. doi:10.1002/ijc.30035

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