1. Department of Psychiatry and Psychotherapy, University Medical Center, Georg‐August‐University Goettingen, Goettingen, Germany
2. Present address: German Center for Neurodegenerative Diseases (DZNE), Dresden, Germany
3. German Center for Neurodegenerative Diseases (DZNE), Goettingen, Germany
4. Molecular Neurobiology, European Neuroscience Institute Goettingen, Goettingen, Germany
5. German Center for Neurodegenerative Diseases (DZNE) Bonn, Bonn, Germany
6. Department of Biochemistry and Molecular Biology, University of Florida, Gainseville, FL, USA