“…Of the 46 studies included in the analysis, 14 were carried out in the United States [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], 11 in China [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], four in each of the United Kingdom [ 27 , 37 , 38 , 39 ] and Switzerland [ 6 , 7 , 40 , 41 ], three in Italy [ 42 , 43 , 44 ], two in South Africa [ 45 , 46 ] and one in each of Germany [ 8 ], Saudi Arabia [ 47 ], Finland [ 48 ], the Netherlands [ 49 ], Australia [ 50 ], Ghana [ 51 ], Pakistan [ 52 ], and Singapore [ 53 ]. There were 20 cross‐sectional studies [ 8 , 15 , 16 , 17 , 24 , 25 , 31 , 32 , 34 ...…”