title: Response to Kinnell letter.
authors.affiliation: Department of Toxicology, Heart of England NHS Foundation Trust, Bordesley Green East, Birmingham B9 5SS, UK alexander.lawson@heartofengland.nhs.uk.
authors.forename: Alexander James Frank
authors.initials: AJ
authors.lastname: Lawson
authors.affiliation: Glaxo Renal Unit, Heart of England NHS Foundation Trust, Bordesley Green East, Birmingham B9 5SS, UK.
authors.forename: Kate Elizabeth
authors.initials: KE
authors.lastname: Shipman
authors.affiliation: Department of Toxicology, Heart of England NHS Foundation Trust, Bordesley Green East, Birmingham B9 5SS, UK.
authors.forename: Stephen Andrew
authors.initials: SA
authors.lastname: George
authors.affiliation: Glaxo Renal Unit, Heart of England NHS Foundation Trust, Bordesley Green East, Birmingham B9 5SS, UK.
authors.forename: Indranil
authors.initials: I
authors.lastname: Dasgupta