Efficacy of FFP3 respirators for prevention of SARS-CoV-2 infection in healthcare workers by Mark Ferris, Rebecca Ferris, Chris Workman, Eoin O'Connor, David A Enoch, Emma Goldesgeyme, Natalie Quinnell, Parth Patel, Jo Wright, Geraldine Martell, Christine Moody, Ashley Shaw, Christopher JR Illingworth, Nicholas J Matheson, Michael P Weekes

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