Chavez-Ruiz M, Rueda-Torres L, Ruffner-Camargo B, Bellido-Achahui C. Methodology for evaluating the level of respiratory protection of masks and respirators against particles similar to those that transmit SARS-CoV-2. Rev Peru Med Exp Salud Publica [Internet]. 2021 Sep. 30 [cited 2024 May 3];38(3):391-8. Available from: https://rpmesp.ins.gob.pe/index.php/rpmesp/article/view/8036