PMC:7306567 / 24354-24512 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T184","span":{"begin":0,"end":158},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"However, one problem is that the background incidence varies in different regions, making it difficult to develop generalized guidelines that apply uniformly."}