1. Division of Pediatric Hemato‐Oncology Department of Pediatrics and Adolescent Medicine Medical University of Graz Graz Austria
2. Department of Pediatric and Adolescent Surgery Medical University of Graz Graz Austria
3. Pediatric Hematology/Oncology Department of Pediatrics University Hospital Tuebingen Tübingen Germany
4. Institute of Pathology Medical University of Graz Graz Austria
5. Division of General Pediatrics Department of Pediatrics and Adolescent Medicine Medical University of Graz Graz Austria
6. Division of Pediatric Radiology Department of Radiology Medical University of Graz Graz Austria
7. Section of Pediatric Pathology Department of Pathology University Hospital Bonn Bonn Germany
8. Clinic of Pediatrics Klinikum Dortmund Witten/Herdecke University Dortmund Germany