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4. Ars toscana edited by C. Silvestri, Health Regional Agency in Toscana (Italy) and C. Stasi. Available from: https://www.ars.toscana.it/2-articoli/4408-nuovo-coronavirus-vaccini-in-sperimentazione.html. Accessed October 23, 2021.
5. Effect of 2 Inactivated SARS-CoV-2 Vaccines on Symptomatic COVID-19 Infection in Adults