“…Characteristics and quality of the 24 articles (1244 participants: only control groups) included in systematic review, of which 21 were included for meta‐analysis are shown in Table 1 . 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 The trials were published between 1963 and 2021. Most trials concerned the treatment of adults with either an anxiety disorder 24 , 28 , 29 , 40 or a depressive disorder, 22 , 23 , 35 , 36 , 37 , 38 , 39 , 40 , 41 with the remaining four aimed at treating adults with schizophrenia or a related disorder.…”