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 1
Figure 1 Flowchart showing the abstract screening and study selection process. CBM: Chinese BioMedical Literature on disc; CMCC: Chinese Medical Current Contents; CNKI: Chinese National Knowledge Infrastructure.