Fontanet, A., Autran, B., Lina, B., Kieny, M., Karim, S. & Sridhar, D. 2021, 'SARS-CoV-2 variants and ending the COVID-19 pandemic', The Lancet, 397(10278), pp. 952-954. https://doi.org/10.1016/S0140-6736(21)00370-6