PMC:7210464 / 59266-59366
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T527","span":{"begin":0,"end":100},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Later, the CSRGC extended the fee waiver policy to train tickets that were bought before February 6."}