1. Laboratoire National de Métrologie et d'Essais (LNE) Department of Bioanalyses Paris, Cedex 15 France
2. Department of Psychiatry and Neurochemistry Institute of Neuroscience and Physiology the Sahlgrenska Academy at the University of Gothenburg, Mölndal Gothenburg Sweden
3. Clinical Neurochemistry Laboratory Sahlgrenska University Hospital Mölndal Sweden
4. Department of Neurodegenerative Disease UCL Institute of Neurology Queen Square London UK
5. UK Dementia Research Institute at UCL London UK
6. Hong Kong Center for Neurodegenerative Diseases Clear Water Bay Hong Kong China