University of Tübingen - Department of Neonatology, University of Tübingen - Department of Neonatology, University of Tübingen - Department of Hematology and Oncology, University of Tübingen - Center for Pediatric Clinical Studies, University of Tübingen - Department of Diagnostic and Interventional Radiology, University of Tübingen - Faculty of Medicine, University of Tübingen - Department of Neonatology, University of Tübingen - Department of Hematology and Oncology and University of Tübingen - Department of Hematology and Oncology