About the Authors

Jon Dobson

bea22@keele.ac.uk

Affiliation Institute for Science & Technology in Medicine, Keele University, Hartshill, Stoke-on-Trent, United Kingdom

Richard Bowtell

Affiliation Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom

Ana Garcia-Prieto

Affiliation London Centre for Nanotechnology, University College London, London, United Kingdom

Quentin Pankhurst

Affiliations London Centre for Nanotechnology, University College London, London, United Kingdom, Davy-Faraday Research Laboratory, The Royal Institution of Great Britain, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JD. Performed the experiments: AGP. Analyzed the data: JD RB AGP QP. Wrote the paper: JD RB AGP QP.