Topic Highlight
Copyright ©2014 Baishideng Publishing Group Inc.
World J Gastroenterol. Aug 21, 2014; 20(31): 10703-10714
Published online Aug 21, 2014. doi: 10.3748/wjg.v20.i31.10703
Table 2 Grades of recommendation[43]
AConsistent level 1 studies
BConsistent level 2 or 3 studies or extrapolations from level 1 studies
CLevel 4 studies or extrapolations from level 2 or 3 studies
DLevel 5 evidence or troubling inconsistent or inconclusive studies of any level