1. Children's Cancer Research Institute and St. Anna Children's Hospital, Department of Pediatrics; Medical University of Vienna; Vienna Austria
2. Laboratory of Pediatric Onco-Hematology, Women and Child Department; University of Padova; Padova Italy
3. Tettamanti Research Center and Department of Pediatrics; Ospedale San Gerardo, University of Milano-Bicocca; Monza Italy
4. Clinic for Oncology and Tumor Immunology; HELIOS Klinikum Berlin-Buch; Berlin Germany
5. Department of Pediatric Hematology and Oncology, 2nd Faculty of Medicine; Charles University and University Hospital Motol; Prague Czech Republic
6. Department of Pediatric Hematology and Oncology; Schneider's Children's Medical Center; Petach-Tikva Israel
7. Cancer Research Center and the Hematology Laboratory, Jeffrey Modell Foundation (JMF) Center, Edmond and Lily Safra Children's Hospital; Sheba Medical Center; Tel Hashomer Israel
8. Division of Oncology and Children's Research Center; University Children's Hospital, University of Zurich; Zurich Switzerland
9. Flow Cytometry Unit; Institute of Clinical Pathology and Medical Research, Westmead Hospital; Sydney Australia
10. Department of Pediatric Oncology/Hematology; Charité Universitätsmedizin; Berlin Germany
11. Department of Pediatrics; University Medical Center Schleswig-Holstein; Kiel Germany