PMC:7281378 / 715-881 JSONTXT

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    LitCovid-PD-CLO

    {"project":"LitCovid-PD-CLO","denotations":[{"id":"T77940","span":{"begin":43,"end":52},"obj":"http://purl.obolibrary.org/obo/BFO_0000030"}],"text":"irus epidemiology and evolution. With this objective, the current systematic review summarizes the original research articles and case reports of all the four types o"}