Brief Article
Copyright ©2012 Baishideng Publishing Group Co.
World J Gastroenterol. Sep 14, 2012; 18(34): 4714-4720
Published online Sep 14, 2012. doi: 10.3748/wjg.v18.i34.4714
Figure 1
Figure 1 Schematic of the search strategy. IPD: individual patient data.