1 Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden. henrik.zetterberg@gu.se.
2 Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden. henrik.zetterberg@gu.se.
3 Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK. henrik.zetterberg@gu.se.
4 UK Dementia Research Institute at UCL, London, UK. henrik.zetterberg@gu.se.
5 Dementia Research Centre, Box 16, National Hospital for Neurology and Neurosurgery, London, UK.