Review evidence assessing the relationship between personal / recipient OR provider OR health system OR policy / legislative specific factors impacting on vaccine coverage. In addition multicomponent interventions, i.e. a combination of interventions to improve coverage; and multilevel interventions, i.e. interventions delivered simultaneously at different levels will be evaluated.
Research question:
What is the size and nature of the existing review evidence on interventions to improve vaccine coverage?
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Only include studies covering primary outcomes. Within these included studies, we will extract data on secondary outcomes.
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