PMC:7314078 / 9302-9383
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T85","span":{"begin":0,"end":81},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"However, some disadvantages include hub congestion and transportation challenges."}