1. Department of Paediatric Haematology and Oncology St. Anna Children's Hospital Medical University Vienna Austria
2. Department of Paediatrics University Hospital Innsbruck Innsbruck Austria
3. Department of Paediatrics Hospital of Barmherzige Schwestern Linz Linz Austria
4. Institute of Pathology Medical University of Vienna Vienna Austria
5. Department of Paediatrics University Hospital Homburg/Saar Homburg Germany
6. Children's Cancer Research Institute Vienna Austria