PMC:7537225 / 29774-29958 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T221","span":{"begin":0,"end":184},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Moreover, the analysis of random effects revealed that countries and areas differed in both stress levels and the association between stress levels and marital status, gender, and age."}