PMC:7784828 / 7825-7948 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T76","span":{"begin":0,"end":123},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Although individual occurrence is rare, collectively rare diseases is a problem affecting 6–8% of the world population [7]."}