"Association Between Cholecystectomy With vs Without Intraoperative Cholangiography and Risk of Common Duct Injury"JAMA Aug 28
http://jama.jamanetwork.com/article.aspx?articleid=1733717 
"Conclusions and Relevance   When confounders were controlled with instrumental variable analysis, there was no statistically significant association between intraoperative cholangiography and common duct injury. Intraoperative cholangiography is not effective as a preventive strategy against common duct injury during cholecystectomy."