PMC:7281378 / 7394-7627 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T50","span":{"begin":5,"end":7},"obj":"Sentence"},{"id":"T51","span":{"begin":8,"end":15},"obj":"Sentence"},{"id":"T52","span":{"begin":17,"end":21},"obj":"Sentence"},{"id":"T53","span":{"begin":22,"end":68},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"de.\n\n2. Methods\n\n2.1. Systematic Review Protocol and Search Strategy\nThe guidelines and the procedures as detailed by the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) [50] were followed for drafting thi"}