Although intraoperative cholangiogram (IOC) was not performed in any patient in this series, the CBD injury rate of 0.3% compares favorably to that reported by others.[3, 4, 7, 20, 21, 33] We believe that IOC should not be performed routinely as it does not decrease the risk of biliary tree injury[34] particularly now that accurate and less invasive assessment of CBD pathology can be made preoperatively by magnetic resonance cholangiopancreatography.[35]. This evidence concerns the gene OPN1MW and red-green color blindness.