PubMed:33419461 / 7223-7377 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T50","span":{"begin":0,"end":154},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Second, for each cluster the same number of residential addresses is randomly sampled from the municipal registries (self-weighted sample of individuals)."}