1. deCODE genetics/Amgen; Iceland
2. MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience; King's College London; UK
3. MRC Integrative Epidemiology Unit; Oakfield House, Oakfield Grove, University of Bristol; BS8 2EG UK
4. Department of Psychiatry; Landspitalinn University Hospital; Iceland
5. Humus; Reykjavik Iceland
6. SAA-National Center of Addiction Medicine; Iceland
7. Faculty of Psychology; University of Iceland; Iceland
8. Department of Engineering and Natural Sciences; University of Iceland; Iceland
9. Faculty of Medicine; University of Iceland; Iceland