1. Azienda Sanitaria Provinciale 7; Ragusa Italy
2. Servicio de Pediatria; Bio Cruces Health Research Institute; Hospital Universitario Cruces; Barakaldo Bizkaia Spain
3. Departamento de Pediatria; Universidad del Pais Vasco UPV/EHU; Barakaldo Bizkaia Spain
4. Hospital Nacional de Pediatría J. Garrahan; Buenos Aires Argentina
5. Hospital Trousseau; Paris France
6. Children's Cancer Research Institute and St. Anna Children's Hospital; Vienna Austria
7. Childhood Cancer Research Unit; Karolinska Institutet; Karolinska University Hospital; Stockholm Sweden
8. Department of Haematology and Oncology; University Medical Centre; Hamburg Germany
9. Texas Children's Cancer and Hematology Centers; Houston TX USA
10. Children's Research Institute; Children's National Medical Center; Washington DC USA
11. Hospital de Niños Elizalde and Hospital de Clinicas UBA; Buenos Aires Argentina
12. Hospital for Sick Children; Division of Hematology/Oncology; Toronto ON Canada
13. Newcastle University; Newcastle UK