PMC:7116472 / 15822-15966 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T105","span":{"begin":0,"end":144},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Existing risk stratification scores were identified through a systematic literature search of Embase, WHO Medicus, and Google Scholar databases."}