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Face masks have been employed in the COVID-19 pandemic plans as a public and personal health control measure against the spread of SARS-CoV-2. In Poland, obligatory wearing of masks in public spaces was introduced on April 10th, 2020; a relaxation of previous universal measures was announced on May 29th, 2020, limiting use to indoor public places. To assess use of masks or other protective devices in public spaces in Poland during the SARS-Cov-2 epidemic. A non-participatory covert observational study was conducted on three dates, (10.05
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