CholangitisLiver Cirrhosis, BiliaryCholangitis, SclerosingReticulinAutoimmune DiseasesAutoantibodiesSubacute Sclerosing PanencephalitisSclerosisPulmonary Sclerosing HemangiomaCholangiopancreatography, Endoscopic RetrogradeBile DuctsCholagogues and CholereticsUrsodeoxycholic AcidBile Ducts, IntrahepaticBile Duct NeoplasmsCholestasisCholangiographySclerosing SolutionsCholangiocarcinomaAdenoma, Bile DuctCholangiopancreatography, Magnetic ResonanceHepatitis, Autoimmune