https://scrip.pharmaintelligence.informa.com/SC142447/Pfizers-Bourla-On-COVID-19-Vaccine-There-Is-No-ROI-That-Will-Drive-Our-Decision
https://www.fiercepharma.com/pharma/bio-what-s-roi-a-covid-19-vaccine-we-have-no-idea-says-pfizer
https://www.gavi.org/vaccineswork/new-evidence-shows-investments-vaccination-produce-even-greater-returns-previously
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