Toback, S., Galiza, E., Cosgrove, C., Galloway, J., Goodman, A., Swift, P., Rajaram, S., Graves-Jones, A., Edelman, J., Burns, F., Minassian, A., Cho, I., Kumar, L., Plested, J., Rivers, E., Robertson, A., Dubovsky, F., Glenn, G. & Heath, P. 2021, 'Safety, immunogenicity, and efficacy of a COVID-19 vaccine (NVX-CoV2373) co-administered with seasonal influenza vaccines : an exploratory substudy of a randomised, observer-blinded, placebo-controlled, phase 3 trial', Lancet Respiratory Medicine, 10(2), pp. 167-179. https://doi.org/10.1016/S2213-2600(21)00409-4