PMC:7210464 / 755-912 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T4","span":{"begin":2,"end":3},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"d a higher risk to the destination regions than other factors, including geographic proximity and similarity in economic conditions. We quantify the effects "}