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Lopez Bernal, J., Andrews, N., Gower, C., Robertson, C., Stowe, J., et al. (2021) Effectiveness of the Pfizer-BioNTech and Oxford-AstraZeneca Vaccines on Covid-19 Related Symptoms, Hospital Admissions, and Mortality in Older Adults in England: Test Negative Case-Control study. BMJ, 373, n1088.
https://doi.org/10.1136/bmj.n1088
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