1. Sobell Department of Motor Neuroscience and Movement Disorders UCL Institute of Neurology University College London London United Kingdom
2. Department of Neurology University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
3. Department of Neurology Hospital Universitario Virgen de La Arrixaca Murcia Spain
4. Department of Neuropsychiatry The National Hospital for Neurology and Neurosurgery London United Kingdom