Versionsunterschiede von Informationssammlung Corona / Gesichtsmasken Benutzung
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| 1 | National Library of Medicine: | |
| 2 | 2 | * 2005 ((https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2569983/ Public Health Strategy and the Police Powers of the State)) |
| 3 | 3 | * 2009 ((https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662657/ Face Mask Use and Control of Respiratory Virus Transmission in Households)) |