Generally, the following contents should be described: inclusion and exclusion criteria, literature retrieval methods (database, keywords, retrieval logic), data extraction, research quality evaluation, heterogeneity test, merger model selection, publication bias, subgroup analysis, sensitivity analysis, etc. Many people may think that the method part is the best, because they all do it themselves. Yes, this part is the easiest to write, so we all know how to use and operate it. Just describe it truthfully, but are you really right? …