Oncology Unit;
Asst Bergamo Ovest;
Milano 20124;
Italy;
Department of Clinical Oncology;
Fondazione Poliambulanza;
Brescia 25124;
Italy;
Medical Oncology Unit;
Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico;
Milan;
Italy;
Pharmacy Unit;
San Raffaele Hospital;
Milano 20100;
Italy;
Department of Medicine;
Casa di Cura Igea;
Milano 20100;
Italy;
Department of Oncology;
Fondazione Poliambulanza;
Brescia 25124;
Italy;
Tocilizumab; COVID-19; Pandemic; Treatment; Meta-analysis; Review;