1. Department of Pediatric Oncology and Hematology Charité‐Universitätsmedizin Berlin Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
2. Division of Pediatric Hematology and Oncology University Children's Hospital Basel Basel Switzerland
3. Department of Pediatrics St. Anna Children's Hospital Medical University Vienna Vienna Austria
4. Department of Hematology Oncology and Cancer Immunology (CVK/CCM) Charité‐Universitätsmedizin Berlin Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
5. Department of Pediatric Hematology & Oncology Inselspital University Hospital Bern Bern Switzerland
6. Department of Hematology and Central Hematology Laboratory Inselspital Bern University Hospital University of Bern Bern Switzerland
7. Department of Hematology University Hospital Basel Basel Switzerland
8. Department of Pediatric Hematology and Oncology Children's Hospital Zurich Zurich Switzerland
9. Department of Oncology Hematology and Transfusion Medicine Cantonal Hospital Aarau Aarau Switzerland
10. Division of Pediatric Oncology ‐ Hematology Department of Pediatrics Kantonsspital Aarau AG Aarau Switzerland
11. Department of Health Sciences and Medicine University of Lucerne Lucerne Switzerland
12. Department of Pediatrics McMaster Children's Hospital and McMaster University Hamilton Canada
13. Department of Pediatric Oncology and Hematology Cantonal Hospital Lucerne Lucerne Switzerland
14. Department of Oncology and Hematology University Hospital Zurich Zurich Switzerland
15. St. Anna Children's Cancer Research Institute Vienna Austria
16. Institute of Social Medicine Epidemiology and Health Economics Charité‐Universitätsmedizin Berlin Freie Universität Berlin und Humboldt‐Universität zu Berlin Berlin Germany
17. Berlin Institute of Health (BIH) Anna‐Louisa‐Karsch‐Straße 2 Berlin Germany