Blood transfusion needs in COVID‐19 patients: An observational prospective unicentric study. Issue 4 (13th June 2022) - La Rocca, Ursula; Giovannetti, Gianluca; Maldarelli, Federica; Farinelli, Mirella; Piazzolla, Mario; Angeloni, Antonio; Pugliese, Francesco; Coluzzi, Serelina