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. 2017 Apr 28;7:153. doi: 10.3389/fcimb.2017.00153

Figure 2.

Figure 2

(A) Bar chart comparing percentage risk of bias for each included RCT. The risk of bias was quite low. (B) Risk of bias for each included RCT, representing low risk of bias (+), high risk of bias (−), and unclear risk of bias (?).