de Sousa, C. 2021. Correction to the article “Implementing an Influenza Vaccine Effectiveness Study in a Hospital Context in Portugal: The EVA Hospital Project”, Published on Acta Med Port 2021 Jan;34(1):20-27. Acta Médica Portuguesa. 34, 1 (Jan. 2021), 70–73. DOI:https://doi.org/10.20344/amp.15515.