1. Department of Paediatrics University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Division of Neonatology and Paediatric Intensive Care University Medical Center Hamburg‐Eppendorf Hamburg Germany
3. Department of Paediatric Oncology, Haematology and Clinical Immunology University Hospital Düsseldorf Düsseldorf Germany
4. Department of Paediatric Haematology and Oncology University Medical Center Hamburg‐Eppendorf Hamburg Germany
5. Division of Infectious Diseases First Department of Medicine University Medical Center Hamburg‐Eppendorf Hamburg Germany
6. Institute of Medical Microbiology, Virology and Hygiene University Medical Center Hamburg‐Eppendorf Hamburg Germany
7. Institute of Pathology University Medical Center Hamburg‐Eppendorf Hamburg Germany
8. Department of Dermatology and Venereology University Medical Center Hamburg‐Eppendorf Hamburg Germany