Haemodialysis treatment, initially only for patients with reversible acute kidney injury, was pioneered in three sites in the United Kingdom in the 1950s, one of which was in Yorkshire at the Leeds General Infirmary. The treatment then became available for people with kidney failure which was not going to recover, initially cited at the big hospitals in Leeds, Sheffield and Hull. Subsequently kidney units were established in the hospitals in Bradford and York and more recently Doncaster. As well as the six main unit renal dialysis centres in these cities, there are 20 satellite dialysis units which were opened to serve local communities and reduce the need for patients to travel long distances for treatment. These units serve from Skipton in the West to Scarborough in the North East, Grimsby in the East and Chesterfield the most southerly. The geographical area covered is West Yorkshire, North Yorkshire, the East Riding of Yorkshire, South Yorkshire, along with North Lincolnshire, and patients travel from the adjoining regions particularly Darbyshire and Bassetlaw.