Cholestasis, ExtrahepaticBile DuctsBile Ducts, ExtrahepaticCholestasisCommon Bile DuctBile Duct NeoplasmsBileJaundice, ObstructiveBile Duct DiseasesBile Acids and SaltsBile Ducts, IntrahepaticHepatic Duct, CommonCholangiopancreatography, Endoscopic RetrogradeCholangitisCommon Bile Duct DiseasesBiliary Tract DiseasesCholangiographyCholedochostomyGallstonesDrainageBiliary TractIntestinal ObstructionAirway ObstructionAdenoma, Bile DuctCommon Bile Duct NeoplasmsCholangiocarcinomaJaundiceCholestasis, IntrahepaticBiliary Tract Surgical ProceduresBiliary Tract NeoplasmsBiliary AtresiaLiverKlatskin's TumorUreteral ObstructionCholelithiasisLigationBilirubinPalliative CarePancreatic DuctsCholangiopancreatography, Magnetic ResonanceAmpulla of VaterGallbladderCholecystectomyGallbladder NeoplasmsImino AcidsSphincterotomy, EndoscopicPlasticsCystic DuctStentsLiver DiseasesPancreatitisBiliary FistulaPortal VeinConstriction, PathologicTechnetium Tc 99m LidofeninDigestive System NeoplasmsDuodenoscopyPancreatic NeoplasmsSphincterotomy, TranshepaticCholecystitisCholecystectomy, LaparoscopicDuodenal ObstructionEndoscopyLiver NeoplasmsAnastomosis, Roux-en-YLiver Cirrhosis, BiliaryThoracic DuctLiver Function TestsDuodenumPostoperative ComplicationsRetrospective StudiesUrinary Bladder Neck ObstructionUrethral ObstructionTreatment OutcomeEndosonographyNasal ObstructionGastric Outlet ObstructionAnastomosis, SurgicalCholedocholithiasisTomography, X-Ray ComputedCatheterizationGlycocholic AcidLacrimal Duct ObstructionHemobiliaCholedochal CystVentricular Outflow ObstructionMetalsAlkaline PhosphataseSalivary DuctsHepatitisHepatectomyJejunostomyBile PigmentsBile CanaliculiLiver CirrhosisHypertension, PortalTime FactorsFollow-Up StudiesNasolacrimal DuctCholangitis, Sclerosing