PMC:7796344 / 614-655
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T7","span":{"begin":4,"end":12},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ia. Methods: A cross sectional survey was"}