1. Sobell Department of Motor Neuroscience and Movement Disorders; University College London (UCL) Institute of Neurology; London United Kingdom
2. Dipartimento di Scienze Neurologiche e del Movimento; Università di Verona, Policlinico Borgo Roma; Verona Italy
3. Second Department of Neurology; Kapodistrian University of Athens; Athens Greece
4. Neurology Clinic; Philipps University; Marburg Germany
5. Neurology; University Medical Center Hamburg-Eppendorf (UKE); Hamburg Germany
6. Department of Pediatric and Adult Movement Disorders and Neuropsychiatry; Institute of Neurogenetics; University of Lübeck; Lübeck Germany
7. Department of Neurology; Safarik University; Kosice Slovakia
8. Louis Pasteur University Hospital; Kosice Slovakia