PubMed:32049687 / 796-801
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T143","span":{"begin":0,"end":5},"obj":"VB"}],"text":"occur"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok162","span":{"begin":0,"end":5},"obj":"VB"},{"id":"event4","span":{"begin":0,"end":5},"obj":"OCCURRENCE"}],"text":"occur"}