aDepartment of Nephrology and Transplantation, Manchester Royal Infirmary, Manchester University NHS Foundation Trust, Manchester

bDepartment of Nephrology and Transplantation, Guy's Hospital, Guy's and St Thomas’ NHS Foundation Trust, London

cNHS Blood and Transplant, Bristol, UK

Correspondence to Chris J. Callaghan, Consultant Transplant Surgeon, Department of Nephrology and Transplantation, 6th Floor, Borough Wing, Guy's Hospital, Great Maze Pond, London SE1 9RT, UK. E-mail: [email protected]