Menezes, Ana Maria B, Pedro Curi Hallal, Mariângela Freitas Silveira, Fernando C Wehrmeister, Bernardo Lessa Horta, Aluísio Jardim Dornellas de Barros, Fernando Pires Hartwig, Paula Oliveira, Luís Paulo Vidaletti, Marilia A Mesenburg, Nadege Jacques, Fernando C Barros, and Cesar Gomes Victora. 2021. “Influenza Vaccination in the Elderly During the COVID-19 Pandemic: A Population-Based Study in 133 Brazilian Cities”. SciELO Preprints. https://doi.org/10.1590/SciELOPreprints.1797.