PubMed:32118394 / 733-742
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T114","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"difficult"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok122","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"difficult"}