PMC:7116472 / 175-222
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T2","span":{"begin":3,"end":11},"obj":"Sentence"},{"id":"T3","span":{"begin":12,"end":21},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"e\n\nAbstract\nObjective\nTo develop and validate a"}