1. Department of Oncology Hematology, University Hospital, Poitiers, France
2. Department of Pediatrics, University Hospital, Lille, France
3. Department of Pediatrics, St Louis Hospital, Paris, France
4. Department of Pediatrics, Trousseau Hospital, Paris, France
5. Department of Pediatrics, University Hospital, Grenoble, France
6. Department of Pediatrics, University Hospital, Lyon, France
7. Department of Pediatrics, University Hospital, Nancy, France