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Quantitative analysis for anxiety of randomized controlled trials receiving either probiotics or placebo treatment. Eskandarzadeh 2021 [30], Gualtieri 2020 [42], Ho 2021 [43], Karbownik 2020 [46], Kato-Kataoka 2016 [47], Messaoudi 2011 [52], Nishida 2019 [56], Östlund-Lagerström 2016 [59], Patterson 2020 [60], Raygan 2018 [62], Raygan 2019 [63], Roman 2018 [65], Sanchez 2017 [68], Steenbergen 2015 [73], Takada 2016 [74], Takada 2017 [75], Tran 2019 [76].
