“…Owing to the inability to blind the initial intervention, a blinded assessment of outcome was considered important to minimize bias, and in 21 36,42 -44,46 -49, 52-56,59 -77 of 25 selected studies, blinding of the outcome assessment was specifically undertaken. However, only four studies 38,43,50,51,59,60 succeeded in capturing X85% of outcome data at the last point of follow-up.…”