Original Article
Copyright ©2014 Baishideng Publishing Group Inc.
World J Gastrointest Endosc. Sep 16, 2014; 6(9): 419-431
Published online Sep 16, 2014. doi: 10.4253/wjge.v6.i9.419
Figure 1
Figure 1 Preferred reporting items for systematic reviews and meta-analysis flow chart.