@article{:/content/10.2807/ese.16.20.19868-en, author = "Flasche, S and Slack, M and Miller, E", title = "Long term trends introduce a potential bias when evaluating the impact of the pneumococcal conjugate vaccination programme in England and Wales", journal = "Eurosurveillance", year = "2011", volume = "16", number = "20", eid = 19868, pages = "", url = "https://www.eurosurveillance.org/content/10.2807/ese.16.20.19868-en", doi = "https://doi.org/10.2807/ese.16.20.19868-en" }