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Flowchart of study selection. Abbreviations: AMED, Allied and Complementary Medicine Database; CBM, China Biomedical Literature; CHM, Chinese Herbal Medicine; CINAHL, Cumulative Index to Nursing and Allied Health Literature; CNKI, China National Knowledge Infrastructure database; Cochrane (CENTRAL), Cochrane Central Register of Controlled Trials; CQVIP, Chongqing VIP; Embase, Excerpta Medica Database; MCI, mild cognitive impairment; RCT, randomized controlled trial.
