1. Department of Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany;
2. Pediatric Oncology Hematology & Stem Cell Transplantation, Columbia University Medical Center, New York, NY, USA;
3. Dr. von Hauner Children’s Hospital, Ludwig-Maximilians-Universität München, Munich, Germany;
4. Institute of Virology, Hannover Medical School, Hannover, Germany;
5. Center of Pediatrics, University of Halle/Saale, Halle, Germany;
6. Pediatric Hematology and Oncology, Department of Pediatrics, Justus Liebig University of Gießen, Gießen, Germany;
7. Medical Faculty of the Martin-Luther-University Halle-Wittenberg, Halle, Germany
8. Institute of Pathology, Hannover Medical School, Hannover, Germany;
9. Pediatric Hematology and Oncology, Department for Pediatrics III, University Hospital of Essen, Essen, Germany;
10. Integrated Research and Treatment Center Transplantation (IFB-Tx), Hannover, Germany;