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Zurück zum Zitat Cheng Y et al (2021) Face masks effectively limit the probability of SARS-CoV‑2 transmission. Science. https://doi.org/10.1126/science.abg6296CrossRefPubMedPubMedCentral Cheng Y et al (2021) Face masks effectively limit the probability of SARS-CoV‑2 transmission. Science. https://​doi.​org/​10.​1126/​science.​abg6296CrossRefPubMedPubMedCentral