1. Department of Diagnostic and Interventional Radiology; University Medical Center, Hamburg-Eppendorf; Hamburg Germany
2. Department of Pediatric Hematology and Oncology; University Medical Center, Hamburg-Eppendorf; Hamburg Germany
3. Children's Hospital & Research Center Oakland; Oakland California USA
4. Department of Obstetrics and Fetal Medicine; University Medical Center, Hamburg-Eppendorf; Hamburg Germany
5. Philips Healthcare; Hamburg Germany