PMC:7594251 / 2309-2482 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T22","span":{"begin":11,"end":165},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"6 billion. The typical development cost is usually spread out over the course of 14 years [1,2,3], making investment even more difficult (i.e., cost recovery delay). This hi"}