PMC:7594251 / 1720-1757 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T16","span":{"begin":11,"end":13},"obj":"Sentence"},{"id":"T17","span":{"begin":14,"end":26},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"elopment.\n\n1. Introduction\nThe unexpe"}