“…Of the 42 studies, 18 were from Asia 14 , 23 , 24 , 25 , 28 , 36 , 37 , 43 , 46 , 47 , 50 , 51 , 53 , 55 , 56 , 60 , 61 , 62 and 24 were from Europe and the Americas. 26 , 27 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 38 , 39 , 40 , 41 , 42 , 44 , 45 , 48 , 49 , 52 , 54 , 57 , 58 , 59 , 63 Seven studies had a case-control design, 28 , 40 , 48 , 50 , 52 , 56 , 62 , 63 32 had a cross-sectional design, 14 , 23 , 24 , 25 , 26 , 27 , 29 , 30 , 31 , 32 , 33 , ...…”