Web-based surveillance of respiratory infection outbreaks: retrospective analysis of Italian COVID-19 epidemic waves using Google Trends oleh Gloria Porcu, Gloria Porcu, Yu Xi Chen, Yu Xi Chen, Andrea Stella Bonaugurio, Andrea Stella Bonaugurio, Simone Villa, Leonardo Riva, Leonardo Riva, Vincenzina Messina, Vincenzina Messina, Giorgio Bagarella, Giorgio Bagarella, Mauro Maistrello, Mauro Maistrello, Olivia Leoni, Danilo Cereda, Fulvio Matone, Andrea Gori, Andrea Gori, Giovanni Corrao, Giovanni Corrao, Giovanni Corrao