1. Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
2. Thermo Scientific, Kungens Kurva, Stockholm, Sweden
3. Thermo Scientific, Hemel Hempstead, UK
4. Institute for Reference Materials and Measurements, Joint Research Centre, European commission, Geel, Belgium
5. Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark
6. Department of Clinical Sciences, Lund University, Lund, Sweden
7. Memory Clinic, Department of Neurology, Skåne University Hospital, Malmö, Sweden
8. UCL Institute of Neurology, Queen Square, London, UK