1. Department of Neurology University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Sobell Department of Motor Neuroscience and Movement Disorders University College London Institute of Neurology University College London London United Kingdom
3. International Parkinson's Centre of Excellence King's College and King's College Hospital Denmark Hill Campus London United Kingdom
4. Queen Elizabeth Hospital, Woolwich Lewisham and Greenwich National Health Service Trust London United Kingdom
5. Department of Clinical Neurosciences University of Calgary Calgary Alberta Canada