The OpenSAFELY Collaborative, Green, A., Curtis, H., Hulme, W., Williamson, E., McDonald, H., Bhaskaran, K., Rentsch, C., Schultze, A., Mackenna, B., Mahalingasivam, V., Tomlinson, L., Walker, A., Fisher, L., Massey, J., Andrews, C., Hopcroft, L., Morton, C., Croker, R., Morley, J., Mehrkar, A., Bacon, S., Evans, D., Inglesby, P., Hickman, G., Ward, T., Davy, S., Mathur, R., Tazare, J., Eggo, R., Wing, K., Wong, A., Forbes, H., Bates, C., Cockburn, J., Parry, J., Hester, F., Harper, S., Douglas, I., Evans, S., Smeeth, L. & Goldacre, B. 2022, 'Describing the population experiencing COVID-19 vaccine breakthrough following second vaccination in England: a cohort study from OpenSAFELY', BMC Medicine, 20, article no: 243. https://doi.org/10.1186/s12916-022-02422-0