“…All the eligible studies were published between 1991 and 2012.There were 20 studies performed in Asian subjects [ 11 , 38 , 47 , 51 , 57 , 58 , 60 , 63 , 65 , 66 ], 26 in Caucasian subjects [ 17 , 20 - 22 , 36 , 37 , 40 - 46 , 49 , 50 , 52 - 56 , 59 , 61 , 62 , 64 , 67 ] and one mixed- population study [ 48 ]. In consideration of the study design, 6 studies were prospective [ 20 , 40 , 43 , 45 , 49 ] and the remaining 41 studies were retrospective [ 11 , 17 , 21 , 22 , 36 - 38 , 41 , 42 , 44 , 46 - 48 , 50 - 67 ]. In addition,11 of the 47 studies were P-B [ 20 - 22 , 36 , 37 , 40 , 43 , 46 , 49 , 54 ] and the remaining studies were H-B [ 11 , 17 , 38 , 39 , 41 , 42 , 44 , 45 , 47 , 48 , 50 -…”