1. Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics; Oslo University Hospital; Norway
2. Centre for Cancer Biomedicine, Faculty of Medicine; University of Oslo; Norway
3. Institute of Clinical Medicine, Faculty of Medicine; University of Oslo; Norway
4. Department of Neurosurgery; Oslo University Hospital; Norway
5. Department of Pathology; Rigshospitalet; Copenhagen Denmark
6. Department of Pathology; Oslo University Hospital; Norway
7. Department of Oncology; Oslo University Hospital-The Norwegian Radium Hospital; Norway