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Ⅰ.Narrative review vs.Systematic reviewrnNarrative review is a non-systematic review of a topic,after a comprehensive,critical and objective analysis of current literature.It is not required to list the types of databases and methodological approaches used,nor the evaluation criteria for inclusion of retrieved articles during databases search.These review articles use a qualitative approach.After full understanding of the topic reviewed,you may then identify any knowledge gaps or inconsistencies.This will lead to a research question (PICO) that justifies conducting further study.