Use of respirator vs. surgical masks in healthcare personnel and its impact on SARS-CoV-2 acquisition: a prospective multicentre cohort study
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M. Schlegel | P. Rieder | S. Haller | O. Leal-Neto | C. Kahlert | P. Kohler | D. Vuichard-Gysin | A. Friedl | B. Wiggli | G. Scanferla | S. Guesewell | T. Egger | A. Brucher | M. Ruetti | R. Stocker | U. Besold | D. Flury | E. Lemmenmeier | A. McGeer | S. Kuster | R. Thoma | P. Vernazza | L. Risch | J. Moeller