1 “.... One method is to search ClinicalTrials.gov (CT.gov) and (a) compare studies identified...”

2 Subjects: “...Clinical Trials as Topic...”

3 “... outcome with surgical aortic valve replacement. Well-designed observational studies and decision modeling...”

4 “... outcome with surgical aortic valve replacement. Well-designed observational studies and decision modeling...”

5 “...), and the Cochrane Database of Systematic Reviews for English-language studies published since 1990 that compared...”

6 “...), and the Cochrane Database of Systematic Reviews for English-language studies published since 1990 that compared...”

7 “...), and the Cochrane Database of Systematic Reviews for English-language studies published from January 1, 2003...”

8 “...), and the Cochrane Database of Systematic Reviews for English-language studies published from January 1, 2003...”