Healthcare institutions’ recommendation regarding the use of FFP-2 masks and SARS-CoV-2 seropositivity among healthcare workers: a multicenter longitudinal cohort study
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M. Risch | M. Genoni | S. Güsewell | C. Hirzel | M. Brüggen | V. Luyckx | W. Kistler | A. Cusini | G. Flury | F. Fleisch | Katarzyna Szajek | P. Egger | S. Hutter | Theresa Bechmann | Amico Study Group | Vedat Luwina Theodor Mauro Gian Marie-Charlotte Andres T Eronat Eichweber von Fellenberg Albertini F | Vedat Eronat | Luwina Eichweber | Theodor von Fellenberg | Mauro Albertini | Andres R. Schneeberger | T. Koch | A. Schneeberger | Marie-Charlotte Brüggen | A. S. Group