“…A total of 48 studies were conducted, involving 3,843 subjects from different countries and regions. Of the 48 studies, 13 were from the United States ( 25 , 31 , 34 – 36 , 39 , 54 , 57 – 60 , 62 , 66 ), 9 were from Denmark ( 42 , 47 , 64 , 65 , 69 , 70 , 72 – 74 ), 5 were from China ( 26 , 28 , 48 , 50 , 63 ), 3 were from Australia ( 27 , 29 , 56 ), 3 were from Canada ( 44 , 45 , 71 ), 3 were from Germany ( 37 , 40 , 55 ), 2 were from Belgium ( 30 , 43 ), 2 were from the Netherlands ( 51 , 61 ), 2 were from Norway ( 46 , 53 ), 2 were from Spain ( 38 , 52 ), 1 was from Greece ( 68 ), 1 was from Korea ( 49 ), 1 was from Turkey ( 67 ), and 1 was from Brazil ( 41 ).…”