“…From the 44 quality assessments, 5 (11%) studies were rated strong [ 9 , 78 , 81 , 84 , 85 ], 6 (14%) high moderate [ 53 , 56 , 66 – 68 , 73 ], 15 (34%) low moderate [ 10 , 52 , 57 , 58 , 61 , 64 , 65 , 69 , 71 , 72 , 75 , 76 , 78 , 83 , 93 ], and 18 (41%) weak [ 33 , 46 – 49 , 51 , 54 , 55 , 59 , 60 , 62 , 70 , 74 , 77 , 79 , 80 , 82 ]. Differences in quality assessment arose mainly from sample representativeness, treatment of missing data, and appropriateness of statistical test(s) used.…”