1. Department of Internal Medicine 5, Hematology and Oncology University Hospital Erlangen Erlangen Germany
2. Hematology Unit, Department of Pediatric Hematology/Oncology IRCCS Istituto Giannina Gaslini Genova Italy
3. Department of Pediatrics University Hospital Erlangen Erlangen Germany
4. Department of Pediatric Hematology and Oncology Klinik Hallerwiese‐Cnopfsche Kinderklinik Nürnberg Germany
5. Department of Pediatric Rheumatology and Immunology University Hospital Münster Münster Germany
6. Lydia Becker Institute of Immunology and Inflammation, Royal Manchester Children's Hospital University of Manchester Manchester UK