1 1Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, London, UK.
2 2Multiple Sclerosis Research Centre, NMR Research Unit, Department of Neuroinflammation, Queen Square Institute of Neurology, University College London, London, UK.
3 3National Institute for Health Research (NIHR), University College London Hospitals Biomedical Research Centre (BRC), London, UK.
4 4High Dimensional Neurology Group, Queen Square Institute of Neurology, University College London, London, UK.
5 5Department of Radiology & Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands.
6 6School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK.