1. Department of Neurology; Maastricht University Medical Center; Maastricht The Netherlands
2. Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Alzheimer Center Limburg; Maastricht University Medical Center; Maastricht The Netherlands
3. Department of Psychiatry; Maastricht University Medical Center; Maastricht The Netherlands
4. Neurology and Movement Disorders Unit; Lille University Medical Center; Lille France
5. Departments of Psychiatry and Neurology; Johns Hopkins University School of Medicine; Baltimore Maryland USA
6. Departments of Neurology and Department of Psychiatry; University of Rochester School of Medicine and Dentistry; Rochester New York USA
7. School of Psychiatry, University of Western Australia and Fremantle Hospital; Fremantle Western Australia Australia
8. Area of Applied Epidemiology, National Center for Epidemiology, and CIBERNED, Carlos III Institute of Health; Madrid Spain