Brief Article
Copyright ©2012 Baishideng Publishing Group Co.
World J Gastroenterol. Feb 28, 2012; 18(8): 821-832
Published online Feb 28, 2012. doi: 10.3748/wjg.v18.i8.821
Figure 12
Figure 12 Risk of bias graph: Review authors' judgments about each risk of bias item for each included study.