1. KORFOR – Center for Alcohol and Drug Research, Stavanger University Hospital, Stavanger, Norway
2. The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway
3. Department of Biological and Medical Psychology, Faculty of Psychology, University of Bergen, Bergen, Norway
4. Division of Psychiatry, Stavanger University Hospital, Stavanger, Norway
5. Centre for Alcohol and Drug Research, Aarhus University, Aarhus, Denmark