“…The 69 studies included 38 (55.1%) randomised trials [ 30 – 42 , 44 , 45 , 48 – 50 , 54 – 56 , 62 – 67 , 72 , 73 , 77 – 83 , 92 – 94 , 97 , 99 , 102 – 110 , 115 – 122 , 125 – 127 , 130 – 139 ] and 31 (44.9%) non-randomised studies [ 43 , 46 , 47 , 51 – 53 , 57 – 61 , 68 – 71 , 74 – 76 , 84 – 91 , 95 , 96 , 98 , 100 , 101 , 111 – 114 , 123 , 124 , 128 , 129 ] (Table 2 and Additional file 1 : Table S2). The included RCTs were largely judged as overall low (1/38; 2.6%) and unclear risk of bias (25/38; 65.8%; Table 2 and Additional file 1 : Table S3).…”