1. Institute of Neuroscience and Medicine-4; Forschungszentrum Juelich GmbH; 52425 Jülich Germany
2. Department of Neurology, Faculty of Medicine; RWTH Aachen University; Aachen Germany
3. Jülich Aachen Research Alliance (JARA) - Translational Brain Medicine, Aachen and Jülich; Germany
4. Department of Nuclear Medicine, Faculty of Medicine; RWTH Aachen University; Aachen Germany