1. Institut d’Hématologie et d’Oncologie Pédiatrique, Lyon, France
2. Hospices Civils de Lyon, Department of Pathology, Lyon, France
3. Centre Léon Bérard, Lyon, France
4. Department of Pathology, Mont-Blanc Pathologie, Argonay, France
5. Department of Pediatric Oncology, Centre Hospitalier Universitaire, Rouen, France