1. Institute of Neurology; Medical University of Vienna; Vienna Austria
2. Prion Disease and Neuropathology Reference Center; Semmelweis University; Budapest Hungary
3. Clinical Neurochemistry Laboratory; Sahlgrenska University Hospital; Mölndal Sweden
4. Institute of Neuroscience and Physiology; Department of Psychiatry and Neurochemistry; Sahlgrenska Academy at the University of Gothenburg; Mölndal Sweden
5. Department of Forensic and Insurance Medicine; Semmelweis University; Budapest Hungary
6. Department of Molecular Neuroscience; UCL Institute of Neurology; Queen Square; London UK