Systematic review protocol (PRISMA-P)
Pre-specify the review, so that the method is a method rather than a description of what you ended up doing.
How this document is used well
The protocol is what makes a review systematic. Written afterwards it is a description; written and registered beforehand it is a constraint, and the constraint is the point — it is what prevents inclusion criteria from drifting toward the studies that support the conclusion you are forming.
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14 required fields outstanding: Title; Review team and roles — who screens, who extracts, who arbitrates; Rationale — why now, and what existing reviews leave unanswered …