Cholestasis, ExtrahepaticBile Ducts, ExtrahepaticHepatic Duct, CommonCholestasisJaundice, ObstructiveBile Duct NeoplasmsCholedochostomyCommon Bile DuctCholangitisIntestinal ObstructionAirway ObstructionBiliary Tract DiseasesCholangiopancreatography, Endoscopic RetrogradeDrainageJaundiceCholangiographyBile DuctsBiliary TractCholangiocarcinomaUreteral ObstructionBiliary Tract NeoplasmsKlatskin's TumorCholestasis, IntrahepaticBiliary AtresiaCommon Bile Duct DiseasesPalliative CareGallstonesBile Ducts, IntrahepaticPlastics