1. Department of Neurology, Division of Neurodegenerative Diseases, Technische Universität Dresden, Dresden, Germany
2. German Center for Neurodegenerative Diseases (DZNE), Rostock, Germany
3. Movement Disorders Clinic, Beelitz-Heilstätten, Germany
4. Parkinson Clinic Wolfach, Wolfach, Germany
5. Department of Neurology, University of Rostock, Rostock, Germany