1. Progression of Neurodegenerative Disease Group, Centre for Medical Image Computing, Department of Computer Science, University College London, Gower Street, London WC1E 6BT, UK
2. Dementia Research Centre, Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, 8-11 Queen Square, London WC1N 3AR, UK
3. Translational Imaging Group, Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, UK
4. Department of Neurology, Washington University School of Medicine, St Louis, MO, 63110, USA
5. UK Dementia Research Institute, University College London, London, UK