“…14,15,24 Quality of Methodology Table 2 shows the 4 studies 14,15,22,24 that met the first quality-assessment criterion of having 2 or more of the following: adequate allocation concealment, blinding (patient, outcome assessor), loss to follow-up lower than 30%, and reported use of intention-to-treat analysis. Four studies 14,15,22,24 were above the second criterion of having a quality-assessment score cutoff of 6. The van Tulder et al 6 scores ranged from 4 to 9 out of a total possible 10.…”