VariFit™ NIV non vented mask with anti-asphyxiation valve
Masking during the COVID-19 pandemic – An update of the evidence | National Collaborating Centre for Environmental Health | NCCEH - CCSNE
Bacterial and fungal isolation from face masks under the COVID-19 pandemic | Scientific Reports
EU lawmakers want "COVID-19 certificate" to guarantee free movement - Xinhua | English.news.cn
IJERPH | Free Full-Text | Evaluation of Protection Level, Respiratory Safety, and Practical Aspects of Commercially Available Snorkel Masks as Personal Protection Devices Against Aerosolized Contaminants and SARS-CoV2
Von der Leyen in self-isolation for 24 hours – EURACTIV.com