1.3 Literature screening and data extraction
Two researchers used the inclusion and exclusion criteria of the literature as the basis to independently realize the precise screening of the literature; the rationality of the literature screening was judged by cross-checking, and if there was any disagreement between the two researchers, they needed to discuss with each other Or consult a third researcher to make the final judgment. Data extraction mainly refers to the extraction of general information, including the author of the literature, publication time, sample size, intervention measures, research results, etc.; in addition, it is necessary to check the methods used in the qualitative research, the time point of data collection, and the number of included cases etc. to extract.