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Voysey, M., Costa Clemens, S. A., Madhi, S. A., Weckx, L. Y., Folegatti, P. M., Aley, P. K., Angus, B. J., Baillie, V., Barnabas, S. L., Bhorat, Q. E., Bibi, S., Briner, C., Cicconi, P., Clutterbuck, E., Collins, A. M., Cutland, C., Darton, T., Dheda, K., Douglas, A. D., … Group, O. C. V. T. (2021). Single Dose Administration, And The Influence Of The Timing Of The Booster Dose On Immunogenicity and Efficacy Of ChAdOx1 nCoV-19 (AZD1222) Vaccine (SSRN Scholarly Paper ID 3777268). Social Science Research Network. https://papers.ssrn.com/abstract=3777268