Shaw, R. H., Stuart, A., Greenland, M., Liu, X., Van-Tam, J. S. N., Snape, M. D., & COM-COV Study Group. (2021). Heterologous prime-boost COVID-19 vaccination: initial reactogenicity data. Lancet, 397(10289), 2043-2046. https://doi.org/10.1016/S0140-6736%2821%2901115-6