Bile Ducts, ExtrahepaticBile Duct NeoplasmsBile DuctsCholestasis, ExtrahepaticAdenocarcinomaHepatic Duct, CommonCommon Bile DuctBile Ducts, IntrahepaticBiliary Tract NeoplasmsAdenoma, Bile DuctBile Duct DiseasesBiliary TractKlatskin's TumorBileBiliary AtresiaBiliary Tract Surgical ProceduresCommon Bile Duct NeoplasmsGallstonesCholangiographyJaundice, ObstructiveCholestasisGallbladder NeoplasmsBile Acids and SaltsCholangitisCholangiopancreatography, Endoscopic RetrogradeCholangiocarcinomaCholedochal CystGallbladderJaundiceCholecystectomyAmpulla of VaterBiliary Tract DiseasesCholangitis, SclerosingSphincterotomy, EndoscopicKeratin-7CholedochostomyDrainageEndosonographyJejunostomyAnastomosis, Roux-en-YCommon Bile Duct DiseasesImmunohistochemistryHepatectomyPancreatic DuctsLiverHepatic ArteryTomography, X-Ray ComputedTreatment OutcomeSpectroscopy, Near-InfraredCystic DuctPrognosisCholelithiasisRetrospective Studies