Scoping review the a broader term to collect the evidence in a structured way where as systematic review is more empirical evidence in more narrowed way. Systematic review is more specific to the research questions and their answer. When we talk about the narrative review we only focus on unstructured review which have no specific scope. This could be a generalized information on any topic which could be biased somehow and does not need any analaysis such as meta analysis or qualitative synthesis of data.
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