Delaloye, Jean-Romain, David Vernez, Guillaume Suarez, Damien de Courten, Walter Zingg, Vincent Perret, César M.J.A. Metzger, and Gilles Richner. “Distribution of Low Quality Filtering Facepiece Respirators During the COVID-19 Pandemic: An Independent Analysis of the Situation in Switzerland”. Swiss Medical Weekly 151, no. 0304 (January 24, 2021): w20459. Accessed June 17, 2024. https://smw.ch/index.php/smw/article/view/2941.