Differences in clinical features and mortality in very old unvaccinated patients (>= 80 years) hospitalized with COVID-19 during the first and successive waves from the multicenter SEMI-COVID-19 Registry (Spain)

Ramos-Rincon, JM; Cobos-Palacios, L; Lopez-Sampalo, A; Ricci, M; Rubio-Rivas, M; Nunez-Rodriguez, MV; Miranda-Godoy, R; Garcia-Leoni, ME; Fernandez-Madera-Martinez, R; Garcia-Garcia, GM; Beato-Perez, JL; Monge-Monge, D; Asin-Samper, U; Bustamante-Vega, M; Rabago-Lorite, I; Freire-Castro, SJ; Miramontes-Gonzalez, JP; Magallanes-Gamboa, JO; Alcala-Pedrajas, JN; Garcia-Gomez, M; Cano-Llorente, V; Carrasco-Sanchez, FJ; Martinez-Carrilero, J; Anton-Santos, JM; Gomez-Huelgas, R – 2022