PMC:7781502 / 2129-2216 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T22","span":{"begin":0,"end":87},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"There is little knowledge on the productivity of medical researches during this period."}