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Use of seasonal influenza and pneumococcal polysaccharide v..:

Thindwa, Deus ; Garcia Quesada, Maria ; Liu, Yang...
https://researchonline.lshtm.ac.uk/id/eprint/4661102/1/Use%20of%20seasonal%20influenza%20and%20pneumococcal%20polysaccharide%20vaccines%20in%20older%20adults%20to%20reduce%20COVID-19%20mortality.pdf.  , 2020