Review
Copyright ©2014 Baishideng Publishing Group Co.
World J Gastroenterol. Jan 7, 2014; 20(1): 100-109
Published online Jan 7, 2014. doi: 10.3748/wjg.v20.i1.100
Figure 1
Figure 1 Preferred reporting items for systematic reviews and meta-analyses flow diagram summary of study selection process.