Meta-Analysis
Copyright ©The Author(s) 2017.
World J Gastroenterol. Jan 14, 2017; 23(2): 345-356
Published online Jan 14, 2017. doi: 10.3748/wjg.v23.i2.345
Figure 3
Figure 3 Summary of the methodological assessment of the included studies basing on the Cochrane handbook. +: Low risk; -: High risk; ?: Unclear.