“…The main characteristics of the selected studies have been outlined in Table 1 . The studies were conducted in Europe ( n = 37; Spain [ 23 , 33 ], Finland [ 25 , 34 ], Israel [ 9 , 15 ], Turkey [ 22 , 24 , 35 – 38 ], Sweden [ 12 , 13 , 39 , 40 ], Norway [ 16 , 19 , 41 – 45 ], Belgium [ 17 , 18 , 45 , 46 ], United Kingdom [ 45 , 47 ], Netherlands [ 20 , 45 ], Denmark [ 45 , 48 ], Switzerland [ 45 ], Austria [ 45 ], Germany [ 45 ] and Italy [ 49 ]), America ( n = 8; Canada [ 21 , 26 , 50 ], USA [ 51 – 53 ] and Argentina [ 4 , 54 ]), Australia ( n = 5) [ 8 , 10 , 11 , 14 , 55 ]), and Taiwan ( n = 1) [ 56 , 57 ]. The results of quality appraisals of the included studies have been summarized in Supplementary Tables S1, S2 .…”