Machado, Ausenda, Verónica Gomez, António Panarra, Jose Poças, Rita Corte-Real, Maria João Peres, Baltazar Nunes, and Em Representação do EVA Hospital Group. 2021. “Implementing an Influenza Vaccine Effectiveness Study in a Hospital Context in Portugal: The EVA Hospital Project”. Acta Médica Portuguesa 34 (1). Lisbon, Portugal:20-27. https://doi.org/10.20344/amp.13438.