“Influenza Vaccination Among Healthcare Workers and Absenteeism from Work Due to Influenza-Like Illness in a Teaching Hospital in Palermo”. Italian Journal of Public Health 7, no. 3 (September 30, 2010). Accessed July 28, 2026. https://test-ojs-unimi-it.archicoop.it/index.php/ijphjournal/article/view/22904.