“…2 . Overall, only four trials were deemed to be at low risk of bias [ 10 , 54 , 55 , 68 ], and 30 and 13 of the remaining trials were evaluated to have some concerns [ 25 , 27 – 35 , 37 , 38 , 43 – 45 , 47 , 49 , 52 , 53 , 57 – 67 ] or be at high risk of bias [ 11 , 26 , 36 , 39 – 42 , 46 , 48 , 50 , 51 , 56 , 69 ], respectively. Many of the concerns were related to the randomization process, measurement of the outcome, and the selection of the reported result.…”