Flinter, Frances A.; Bobrow, M.; Chantler, C.; Cameron, J.S.; Flinter Frances A.; Paediatric Research Unit, Division of Medical & Molecular Genetics, United Medical & Dental Schools of Guy's & St Thomas's Hospitals, Guy's Hospital; Bobrow M.; Paediatric Research Unit, Division of Medical & Molecular Genetics, United Medical & Dental Schools of Guy's & St Thomas's Hospitals, Guy's Hospital; Chantler C.; Department of Paediatric Nephrology, Guy's Hospital; Cameron J.S.; Clinical Sciences Laboratories, Guy's Hospital