1. Department of Neurology; University Hospital Cologne; Cologne Germany
2. National Parkinson Foundation International Centre of Excellence; King's College Hospital; London United Kingdom
3. Department of Neurology and Neurosurgery, Salford Royal Foundation Trust, Manchester Academic Health Science Centre; University of Manchester; Manchester United Kingdom
4. Department of Stereotaxy and Functional Neurosurgery; University Hospital Cologne; Cologne Germany
5. Parkinson and Movement Disorders Unit; IRCCS Hospital San Camillo; Venice Italy
6. Department of Neurosciences; Padova University; Padova Italy
7. Institute of Psychiatry, Psychology and Neuroscience; King's College London; London United Kingdom
8. National Center of Epidemiology and CIBERNED; Carlos III Institute of Health; Madrid Spain
9. Department of Neurology; University Hospital Giessen and Marburg; Marburg Germany