Evolution of in-hospital patient characteristics and predictors of death in the COVID-19 pandemic across four waves: are they moving targets with implications for patient care? - Trecarichi EM; Olivadese V; Davoli C; Rotundo S; Serapide F; Lionello R; Tassone B; La Gamba V; Fusco P; Russo A; Borelli M; Torti C (Frontiers in public health, 2024)