PMC:7116472 / 40407-40555 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T237","span":{"begin":0,"end":148},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Available risk stratification tools have a high risk of bias, small sample size resulting in uncertainty, poor reporting, and lack formal validation"}