PMC:7143846 / 21163-21224
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T170","span":{"begin":0,"end":61},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Table 2 Word frequency analysis before and after 20 January."}