PubMed:33012350 / 377-511 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T5","span":{"begin":0,"end":134},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"We searched the MEDLINE and EMBASE databases and Google for articles reporting the filtration properties of flat cloth or cloth masks."}