1. Departments of Pediatrics and Adolescent Medicine, University Hospital Freiburg, Germany
2. Coagulation Centre Rhine Ruhr, Duisburg, Germany
3. Department of Pediatric Hematology, Oncology and Neurooncology, University Children's Hospital Wuerzburg, Germany
4. Institute of Clinical Biochemistry and Pathobiochemistry - Central Laboratory, University Children's Hospital Wuerzburg, Germany