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Forest plot of protective effect of IOC on BDI during cholecystectomy [30–35]. OR odds ratio, BDI bile duct injury, IOC intraoperative cholangiography. *Unadjusted OR; **The data set of Fletcher et al. [84] is included in the study by Hobbs et al. [30]. ***The data set of Krahenbuhl et al. [85] is included in the study by Giger et al. [35]. Studies were weighted by the square root of the study size. Results are plotted on a natural logarithmic scale
