“…The included studies were published between 1996 and 2021, with 70% of studies published after 2010 and 33% of studies published after 2016. The highest proportion (35%) of included studies were conducted in the USA ( n = 20) [ 40 , 41 , 47 – 49 , 51 – 53 , 59 , 60 , 63 , 74 , 81 , 83 – 86 , 88 , 91 , 93 ] followed by 28% in Europe ( n = 16; Belgium, Italy, Netherlands, Slovenia, Denmark, Germany, Turkey, Finland, Norway and Switzerland) [ 39 , 42 , 43 , 45 , 46 , 50 , 55 , 61 , 62 , 64 – 66 , 68 , 71 , 73 , 77 ], 16% in Asia ( n = 9; Iran and India) [ 55 , 57 , 58 , 69 , 70 , 72 , 75 , 82 , 92 ] and 9% in both Australia ( n = 5) [ 55 , 56 , 78 – 80 ] and UK ( n = 5) [ 38 , 67 , 76 , 89 , 90 ]. In total, 70% ( n = 40) of included studies were of experimental study designs of which 85% ( n = 34) were RCT's [ 38 , 43 – 46 , 50 , 51 , 53 – 56 , 59 , 60 – 63 , 66 ...…”