Lau, W., Murray, M., El-Turki, A., Saxena, S., Ladhani, S., Long, P., … Hsia, Y. (2015). Impact of pneumococcal conjugate vaccines on childhood otitis media in the United Kingdom. Vaccine, 33(39), 5072-9. https://doi.org/10.1016/j.vaccine.2015.08.022 (Original work published 2015)