PMC:7796152 / 1691-1764 JSONTXT

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{"project":"LitCovid-sentences","denotations":[{"id":"T16","span":{"begin":1,"end":13},"obj":"Sentence"},{"id":"T17","span":{"begin":15,"end":19},"obj":"Sentence"},{"id":"T18","span":{"begin":20,"end":50},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" Introduction\n\n1.1. Subjective Age of Older Adults\nSubjective age refers "}