1. Sobell Department of Motor Neuroscience and Movement disorders; UCL Institute of Neurology; London United Kingdom
2. Dipartimento di Scienze Neurologiche e del Movimento; Università di Verona; Verona Italy
3. Neurology; University Medical Center Hamburg-Eppendorf (UKE); Hamburg Germany
4. Second Department of Neurology; Kapodistrian University of Athens; Athens Greece
5. Neurology Clinic; Philipps University; Marburg Germany