1. Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Salgrenska Academy University of Gothenburg Mölndal Sweden
2. Department of Pathology & Laboratory Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
3. Waters Corporation Milford MA USA
4. Chromatographic Sciences Department PPD Laboratories Richmond VA USA
5. Medical & Scientific Relations Division Alzheimer's Association Chicago IL USA
6. Institute for Reference Materials and Measurements (IRMM), Joint Research Centre European Commission Geel Belgium
7. UCL Institute of Neurology London UK