VALENT, F.; GALLO, T. Influenza vaccine effectiveness in an Italian elderly population during the 2016-17 season. Annali dell’Istituto Superiore di Sanità, Rome, IT, v. 54, n. 1, p. 67–71, 2018. Disponível em: https://annali.iss.it/index.php/anna/article/view/631. Acesso em: 4 apr. 2025.