1. Department of Neurology, University Medical Center Goettingen, 37075 Goettingen, Germany
2. Department for NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Goettingen, Germany
3. Magnetic Resonance Center (CERM) and Department of Chemistry “Ugo Schiff”, University of Florence, via Sacconi 6, 50019 Sesto Fiorentino, Italy
4. Research Group for Structural Biology in Dementia, German Center for Neurodegenerative Diseases (DZNE) Goettingen, 37075 Goettingen, Germany