PMC:7796176 / 21131-21268 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T149","span":{"begin":0,"end":137},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Also, adolescents spent more time outdoor if they lived in a low-density area and had access to parks in high-density neighborhoods [28]."}