1. Department of Neurosurgery, Oslo University Hospital—Rikshospitalet , N-0424 Oslo , Norway
2. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo , N-0316 Oslo , Norway
3. Oslo Centre of Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital , N-0424 Oslo , Norway
4. Faculty of Health Sciences, Oslo Metropolitan University , N-0130 Oslo , Norway
5. Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo , N-0316 Oslo , Norway
6. Department of Transplantation Medicine, Oslo University Hospital , N-0424 Oslo , Norway
7. Department of Radiology, Oslo University Hospital—Rikshospitalet , N-0424 Oslo , Norway
8. Department of Geriatrics and Internal medicine, Sorlandet Hospital , N-4836 Arendal , Norway
9. Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg , S-405 30 Gothenburg , Sweden
10. Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital , S-405 30 Gothenburg , Sweden
11. Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square , London WC1E 6BT , UK
12. UK Dementia Research Institute at UCL , London WC1E 6BT , UK
13. Hong Kong Center for Neurodegenerative Diseases, Clear Water Bay , Hong Kong 999077 , China
14. Department of Medicine, UW School of Medicine and Public Health , Madison, WI 53726 , USA