PMC:7274970 / 8372-8392
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T54","span":{"begin":0,"end":20},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"2.2 Data collection"}