PMC:7499623 / 3346-3427
Annnotations
LitCovid-PD-CLO
{"project":"LitCovid-PD-CLO","denotations":[{"id":"T27","span":{"begin":78,"end":79},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":" them about the survey. They were invited to complete the questionnaire using a c"}