Patterns of Comorbidity and In-Hospital Mortality in Older Patients With COVID-19 Infection - Mahmoud, Mona; Carmisciano, Luca; Tagliafico, Luca; Muzyka, Mariya; Rosa, Gianmarco; Signori, Alessio; Bassetti, Matteo; Nencioni, Alessio; Monacelli, Fiammetta; , The GECOVID Study Group (Frontiers in Medicine, 2021)