1. Department of Neurology, University of Rostock, Rostock, Germany
2. German Centre for Neurodegenerative Diseases (DZNE) Rostock, Rostock, Germany
3. Department of Neurology, Technische Universität Dresden, Dresden, Germany
4. Department of Neurology, Elblandklinikum Meißen, Meissen, Germany
5. Department of Nuclear Medicine, Technische Universität Dresden, Dresden, Germany
6. Positron Emission Tomography Division, Helmholtz-Zentrum Dresden-Rossendorf; Dresden, Germany
7. German Cancer Research Centre (DKFZ), Radiology, Heidelberg, Germany