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Szajek, Katarzyna; Fleisch, Felix; Hutter, Sandra; Risch, Martin; Bechmann, Theresa; Luyckx, Valerie A; Güsewell, Sabine; Hirzel, Cédric; Cusini, Alexia (2022). Healthcare institutions' recommendation regarding the use of FFP-2 masks and SARS-CoV-2 seropositivity among healthcare workers: a multicenter longitudinal cohort study. Antimicrobial resistance and infection control, 11(1), p. 6. BioMed Central 10.1186/s13756-021-01047-x
