aDepartment of Renal Dietetics, Royal Devon University Healthcare NHS Foundation Trust, and University of Exeter

bDepartment of Renal Medicine, Northern Care Alliance NHS Foundation Trust

cManchester Academic Health Sciences Centre, University of Manchester, Manchester, UK

Correspondence to Prof. Smeeta Sinha, Directorate of Renal Medicine, Salford Royal Hospital, Stott Lane, Salford M86 8HD, Salford, UK. Tel: +44161787373; e-mail: [email protected]