Fase 3 Pfiser: https://www.pfizer.com/news/press-release/press-release-detail/pfizer-and-biontech-conclude-phase-3-study-covid-19-vaccineFase 3 AstraZeneka https://www.astrazeneca.com/media-centre/press-releases/2020/azd1222-oxford-phase-iii-trials-interim-analysis-results-published-in-the-lancet.html