PMC:7784787 / 3454-3708 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T32","span":{"begin":0,"end":254},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"While inward leakage testing is part of the requirements for personal protective equipment (PPE) masks in European Standard (EN) 149, the standard for medical masks, EN 14683, does not have any requirement for a leakage test – neither inward nor outward."}