1. Department of Basic and Clinical Neurosciences, Institute of Psychiatry, Psychology & Neuroscience, King's College London, and. Parkinson's Foundation Centre of Excellence, King's College Hospital, London, United Kingdom
2. Newcastle Upon Tyne Hospitals NHS Foundation Trust, Clinical Ageing Research Unit, Campus for Ageing and Vitality, Newcastle upon Tyne, United Kingdom
3. JB Medical Ltd, Sudbury, Suffolk, United Kingdom