PMC:7796148 / 32649-32896 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T266","span":{"begin":0,"end":247},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Regarding the strengths of this research, respondents were recruited by using an online research panel with stratified quota sampling to ensure that the sample would meet the characteristics of sex, age, household income of the Italian population."}