Fig. 6From: Diagnostic efficacy of contrast-enhanced gastric ultrasonography in staging gastric cancer: a meta-analysisFunnel plot for publication bias among the included studies. a Funnel plot of 11 papers related to O-CEGUS. b Funnel plot of five papers related to D-CEGUS. c Funnel plot of nine papers related to O-CEGUS after excluding the sources of heterogeneity. d Funnel plot of four papers related to D-CEGUS after excluding the sources of heterogeneity. Each red circle represents a studyBack to article page