1 “...), and the Cochrane Central Register of Controlled Trials(r) and Database of Abstracts of Reviews of Effects through...”

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4 “...), and the Cochrane Central Register of Controlled Trials(r) and Database of Abstracts of Reviews of Effects through...”

5 “.... DATA SOURCES: To identify published studies, we searched MEDLINE, Cochrane Central Register...”

6 “.... DATA SOURCES: To identify published studies, we searched MEDLINE, Cochrane Central Register...”

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