Brief Article
Copyright ©2012 Baishideng Publishing Group Co.
World J Gastroenterol. Feb 28, 2012; 18(8): 847-854
Published online Feb 28, 2012. doi: 10.3748/wjg.v18.i8.847
Figure 1
Figure 1 Flow chart of selection of studies and specific reasons for exclusion from the meta-analysis.