1. Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
2. Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
3. University of Gothenburg, Mölndal, Sweden
4. Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
5. Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the Institute of Neurology, University College London, Queen Square, London, England
6. United Kingdom Dementia Research Institute at University College London, London, England
7. Department of Neurology, Mayo Clinic, Rochester, Minnesota
8. Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands
9. Department of Radiology, Mayo Clinic, Rochester, Minnesota