1. Cancer Genetics Program, The National Children's Research Centre; Crumlin Dublin 12 Ireland
2. Department of Pathology; K.U. Leuven, University Hospital Gasthuisberg; Leuven Belgium
3. Department of Genetics; K.U. Leuven, University Hospital Gasthuisberg; Leuven Belgium
4. Cytogenetics Laboratory, National Centre for Medical Genetics, Our Lady's Children's Hospital; Crumlin Dublin 12 Ireland
5. Division of Neurosurgery; British Columbia's Children's Hospital; Vancouver V6H 3V4 Canada
6. Department of Molecular Oncology; British Columbia Cancer Center; Vancouver V5Z 1L3 Canada
7. Department of Pathology; Our Lady's Children's Hospital; Crumlin Dublin 12 Ireland
8. Department of Histopathology; School of Medicine, University of Dublin; Trinity College Dublin 2 Ireland