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Flowchart of literature search selection. Note: 59 studies that met the inclusion criteria were included in this network meta-analysis (NMA) and traditional meta-analysis. n: numbers. *PubMed (n = 197), Web of Science (n = 209), The Cochrane Library (n = 1,065), CINAHL (n = 207), Chinese Biomedical Database (CBM) (n = 40), China National Knowledge Infrastructure (CNKI) (n = 24), Wan Fang Data (n = 37) and VIP (n = 19).
