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PRISMA flow diagram.
Other reasons for exclusion include such as conference abstracts captured via main searches, summaries and narrative reviews, and letters to the editor.
CENTRAL, Cochrane Central Register of Controlled Trials; PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
aOnly conference proceedings were considered for exclusion by outcome at this stage.
bIncluding 31 full-text publications and 44 conference abstracts.
