title: Erratum.
authors: Department of Medical Physics and Biomedical Engineering, University College London, London, UK. c.elwell@ucl.ac.uk.
authors: Clare E
authors: CE
authors: Elwell
authors: Department of Medical Physics and Biomedical Engineering, University College London, London, UK.
authors: Terence S
authors: TS
authors: Leung
authors: Microvascular Measurements, St. Lorenzen, Italy.
authors: David K
authors: DK
authors: Harrison