1. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA
2. Spaulding Rehabilitation Hospital, Charlestown, MA, USA
3. Home Base, A Red Sox Foundation and Massachusetts General Hospital Program, Boston, MA, USA
4. Division of Clinical Neurosciences, Department of Neurosurgery, Turku Brain Injury Centre, Turku University Hospital, and University of Turku, Turku, Finland
5. Department of Neurosurgery, Tampere University Hospital and University of Tampere, Tampere, Finland
6. Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
7. Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
8. UK Dementia Research Institute at University College London, London, UK
9. Department of Molecular Neuroscience, University College London Institute of Neurology, London, UK