1. Department of Psychiatry and Psychology; School of Mental Health and Neuroscience; Maastricht University Medical Centre; Maastricht The Netherlands
2. University of Groningen; University Medical Center Groningen; University Center for Psychiatry; Groningen The Netherlands
3. Department of Psychosis Studies; Institute of Psychiatry; King's College London; King's Health Partners; London UK
4. Faculty of Psychology; Open University of the Netherlands; Heerlen The Netherlands
5. Department of Human Genetics; University Hospital Gasthuisberg; Catholic University Leuven; Leuven Belgium
6. Department of Neurology; Ghent University Hospital; Ghent Belgium