1. Institute of Neuroscience and Physiology, Department of Neurochemistry, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden,
2. Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden,
3. Clinical Memory Research Unit, Department of Clinical Sciences Malmö, Lund University, Malmö, Sweden,
4. Department of Neurology, Skåne University Hospital, Lund, Sweden, and
5. Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London, UK