1. Pediatric Hematology and Oncology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
2. Division of Neonatology and Pediatric Intensive Care Medicine, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
3. Klinik für Kinder- und Jugendmedizin, Klinikum Itzehoe, Itzehoe, Germany
4. Medilys Laboratory, Haemostaseology, Hamburg, Germany