COVID-19 – The efficacy of the LEAF-mask measured by assessing the viral load of the mask’s inner and outer surface used by nurses in ICUs compared to the N95: a phase II, multicenter, randomized, controlled, open-label, clinical trial protocol. Principles and Practice of Clinical Research, [S. l.], v. 7, n. 1, 2021. DOI: 10.21801/ppcrj.2021.71.1. Disponível em: https://journal.ppcr.org/index.php/ppcrjournal/article/view/128.. Acesso em: 2 may. 2024.