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Reference
[Pfizer baseline rate of severe COVID in placebo group] — FDA document. Table 12. First Severe COVID-19 Occurrence After Dose 1 – Dose 1 All-Available Efficacy. https://www.fda.gov/media/144245/download
[Moderna baseline rate of severe COVID in placebo group] — FDA document. Table 14. Severe COVID-19 Cases Starting 14 Days After Second Dose Based on Adjudication Committee Assessment, Per-Protocol Set. https://www.fda.gov/media/144434/download