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    LitCovid-sentences

    {"project":"LitCovid-sentences","denotations":[{"id":"T231","span":{"begin":0,"end":100},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The study is cross-sectional, which helps us to formulate hypotheses, but we cannot prove causality."}