https://www.medrxiv.org/content/10.1101/2021.07.28.21261159v1.full.pdf
https://web.archive.org/web/20210301062516/https://www.pfizer.com/science/coronavirus/vaccine/
https://investors.modernatx.com/node/11586/pdf
https://cdn.pfizer.com/pfizercom/2020-11/C4591001_Clinical_Protocol_Nov2020.pdf
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