1. King's College London, Institute of Psychiatry, London and NIHR Biomedical Research Centre for Mental Health, London, UK
2. Department of Health Sciences, University of Leicester, Leicester, UK
3. Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
4. Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
5. Institute of gerontology and Geriatrics, University of Perugia, Perugia, Italy
6. INSERM U 558, University of Toulouse, Toulouse, France
7. 3rd Department of Neurology, Medical School, Aristotle University Thessaloniki, Thessaloniki, Greece
8. Medical University of Lodz, Lodz, Poland
9. Department of Neurology, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland