PMC:7210464 / 17210-17390 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T110","span":{"begin":0,"end":180},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"For between-city transmissions, apart from proximity measures based on geographic distance, we also consider similarity in population density and the level of economic development."}