“…Of all, 50 studies reported HCV infection [ 6 , 7 , 9 , 10 , 19 – 63 , 65 ] and 23 studies reported either solely HBV infection or both HBV and HCV infections [ 19 , 21 , 25 , 28 , 32 , 34 – 37 , 41 , 43 – 46 , 52 , 54 – 56 , 58 , 60 , 64 – 66 ]. Regarding the study location, 21 studies were conducted in Europe [ 9 , 10 , 21 , 24 , 25 , 27 , 33 , 34 , 39 , 42 , 45 – 47 , 49 , 52 , 55 , 56 , 58 , 60 , 63 , 65 ], 18 were conducted in America [ 6 , 7 , 20 , 22 , 23 , 26 , 29 – 32 , 37 , 38 , 50 , 57 , 59 , 61 , 62 , 66 ], 2 in South-East Asia [ 41 , 48 ], 7 in East Mediterranean [ 28 , 36 , 40 , 43 , 44 , <...>…”