1. Department of Pediatrics; St. Anna Children's Hospital; Medical University Vienna; Vienna Austria
2. Orthopedic Surgery Hospital Speising; Vienna Austria
3. Department of Clinical Pathology; Medical University Vienna; Vienna Austria
4. Department of Pediatric Surgery; Medical University Vienna; Vienna Austria
5. Children's Cancer Research Institute; Vienna Austria
6. Klinikum Stuttgart-Olgahospital; Pediatrics 5 - Oncology, Hematology, Immunology; Stuttgart Germany