Fig. 1.
Flow diagram of study selection. Abbreviations: CENTRAL Cochrane Central Register of Controlled Trials; CDSR Cochrane Database of Systematic Reviews; IPD individual patient data; KSR Kleijnen Systematic Reviews Ltd; Ti/Ab title/abstract.
Flow diagram of study selection. Abbreviations: CENTRAL Cochrane Central Register of Controlled Trials; CDSR Cochrane Database of Systematic Reviews; IPD individual patient data; KSR Kleijnen Systematic Reviews Ltd; Ti/Ab title/abstract.