Systematic Reviews
Copyright ©The Author(s) 2017.
World J Meta-Anal. Dec 26, 2017; 5(6): 150-166
Published online Dec 26, 2017. doi: 10.13105/wjma.v5.i6.150
Figure 3
Figure 3 Quality assessment using the Newcastle-Ottawa Scale for risk of bias included in the systematic review. The absolute numbers of the studies are shown in boxes.