PMC:7224658 / 11351-11360
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T91","span":{"begin":0,"end":9},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"2019 2020"}