Distribution of low quality filtering facepiece respirators during the COVID-19 pandemic: an independent analysis of the situation in Switzerland. Swiss Medical Weekly, [S. l.], v. 151, n. 0304, p. w20459, 2021. DOI: 10.4414/smw.2021.20459. Disponível em: https://smw.ch/index.php/smw/article/view/2941. Acesso em: 22 oct. 2025.