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. 2019 Aug 5;9:190. doi: 10.1038/s41398-019-0515-5

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© The Author(s) 2019, corrected publication 2021

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Fig. 1 — Flow chart of literature search and study selection. This figure described the route of studies inclusion. Among 204 researches from database and other studies, there are 26 trials were satisfied for the criteria of our study. MDD major depressive disorder, RCT randomized control trial

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