Comparison of the characteristics, morbidity and mortality of COVID-19 between first and second/third wave in a hospital setting in Lombardy: a retrospective cohort study by Leidi, Francesca, Boari, Gianluca Edoardo Mario, Scarano, Ottavio, Mangili, Benedetta, Gorla, Giulia, Corbani, Andrea, Accordini, Beatrice, Napoli, Federico, Ghidelli, Chiara, Archenti, Giulia, Turini, Daniele, Saottini, Michele, Guarinoni, Vittoria, Ferrari-Toninelli, Giulia, Manzoni, Francesca, Bonetti, Silvia, Chiarini, Giulia, Malerba, Paolo, Braglia-Orlandini, Federico, Bianco, Gianluca, Faustini, Cristina, Agabiti-Rosei, Claudia, De Ciuceis, Carolina, Rizzoni, Damiano

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