Biliary Tract Surgical ProceduresBiliary Tract NeoplasmsBiliary Tract DiseasesBiliary TractGallbladder NeoplasmsSurgical Procedures, OperativeCholangiocarcinomaGallstonesBile Duct NeoplasmsCholelithiasisBile Ducts, ExtrahepaticCholecystectomyBile Ducts, IntrahepaticCholangitisGallbladderMotor SkillsColonic NeoplasmsAmpulla of VaterTreatment OutcomeBile DuctsPostoperative ComplicationsCommon Bile DuctCholedochostomyBileRetrospective StudiesCholecystitisCholestasisColon, DescendingCholangiopancreatography, Endoscopic RetrogradeCholangiographyBiliary FistulaTime FactorsSurgical Procedures, MinorBile Duct DiseasesDrainage