Are antigenic tests useful for detecting SARS-CoV-2 infections in patients accessing to emergency departments? Results from a North-West Italy hospital. Issue 2 (August 2021) - Caramello, Valeria; Boccuzzi, Adriana; Basile, Vittoria; Ferraro, Anita; Macciotta, Alessandra; Catalano, Alberto; Costa, Giuseppe; Vineis, Paolo; Sacerdote, Carlotta; Ricceri, Fulvio