1. Department of Psychiatry; Maastricht University Medical Center; Maastricht the Netherlands
2. Neurology and Movement Disorders Unit; Lille University Medical Center; Lille France
3. Department of Psychiatry and Behavioral Science; Johns Hopkins University School of Medicine; Baltimore USA
4. School of Psychiatry; University of Western Australia and Fremantle Hospital; Fremantle Australia
5. Departments of Psychiatry and Neurology; Perelman School of Medicine at the University of Pennsylvania, and Parkinson's Disease Research Education and Clinical Center, Philadelphia Veterans Affairs Medical Center; Philadelphia Pennsylvania USA
6. Alzheimer Disease Research Unit and CIBERNED; CIEN Foundation, Carlos III Institute of Health, Alzheimer Center Reina Sofia Foundation; Madrid Spain