Determinants of SARS-CoV-2 infection in Italian healthcare workers: a multicenter study oleh Paolo Boffetta, Francesco Violante, Paolo Durando, Giuseppe De Palma, Enrico Pira, Luigi Vimercati, Alfonso Cristaudo, Giancarlo Icardi, Emma Sala, Maurizio Coggiola, Silvio Tafuri, Vittorio Gattini, Pietro Apostoli, Giovanna Spatari, Working Group on SARS-CoV-2 Infection in Italian Healthcare Workers