Epidemiology of primary biliary cirhosis (PBC) in Sheffield updated: Demographics and relationship to water supply: Dominic Ray-Chaudhuri, Elizabeth Rigney, Keith McCormack, Nigel Trudgill, Liver Unit, Sheffield Teaching Hospitals Trust, Sheffield Uk; Asha Dube, Department of Pathology, Sheffield Teaching Hospitals Trust, Sheffield Uk; Tony Milford-Ward, Department of Immunology, Sheffield Teaching Hospitals Trust, Sheffield Uk; Dermot Gleeson, Liver Unit, Sheffield Teaching Hospitals Trust, Sheffield Uk