Vasileiou, E., Shi, T., Kerr, S., Robertson, C., Joy, M., Tsang, R., McGagh, D., Williams, J., Hobbs, R., de Lusignan, S., Bradley, D., O'Reilly, D., Murphy, S., Chuter, A., Beggs, J., Ford, D., Orton, C., Akbari, A., Bedston, S., Davies, G., Griffiths, L., Griffiths, R., Lowthian, E., Lyons, J., Lyons, R., North, L., Perry, M., Torabi, F., Pickett, J., McMenamin, J., McCowan, C., Agrawal, U., Wood, R., Stock, S., Moore, E., Henery, P., Simpson, C. & Sheikh, A. 2022, 'Investigating the uptake, effectiveness and safety of COVID-19 vaccines: protocol for an observational study using linked UK national data', BMJ Open, 12(2), article no: e050062. https://doi.org/10.1136/bmjopen-2021-050062