1. Division of Molecular Psychiatry, Department of Psychiatry, University Medicine Goettingen, Goettingen, Germany
2. Synaptic Systems GmbH, Goettingen, Germany
3. Department of Public Health/Geriatrics, Uppsala University, Uppsala, Sweden
4. Department of Pathology, University and University Hospital of Helsinki, Helsinki, Finland
5. Department of Neurology, Helsinki University Central Hospital, Helsinki, Finland