1. Department of Paediatrics, Medical University of Innsbruck (MUI), Austria
2. Department of Interal Medicine, Haematology/Oncology, University of Münster, Germany
3. Department of Paediatric Haematology and Oncology, University Medical Centre Hamburg-Eppendorf, Germany
4. Department of Pediatric Haemostaseology, Medical Faculty Carl Gustav Carus of Technical University Dresden, Germany