1. French Reference Centre for Langerhans Cell Histiocytosis; Trousseau Hospital; Paris France
2. EA4340; UVSQ; Université Paris-Saclay; Boulogne-Billancourt France
3. Department of Paediatric Haematology and Oncology; Trousseau Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
4. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Nantes; Nantes France
5. Department of Paediatric Immunology, Haematology and Rheumatology; Necker Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
6. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Lille; Lille France
7. Department of Paediatric Oncology; Institut d'Hémato-Oncologie Pediatrique; Lyon France
8. Department of Paediatrics; Hôpital Arnaud de Villeneuve; Centre Hospitalo-Universitaire de Montpellier; Montpellier France
9. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Toulouse; Toulouse France
10. Department of Paediatric Haematology and Oncology; CIC 1401 - INSERM CIC-P; Centre Hospitalo-Universitaire de Bordeaux; Bordeaux France
11. Paediatric, Adolescent and Young Adult Oncology Department; Institut Curie Medical Centre; Paris France
12. Department of Paediatric Haematology and Oncology; Assistance Publique - Hôpitaux de Marseille; Marseille France
13. Department of Paediatric and Adolescent Oncology; Institut Gustave Roussy; Villejuif France
14. Sorbonne Université; UPMC Univ Paris 6; Paris France
15. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Nancy; Vandœuvre-lès-Nancy France
16. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Strasbourg; Strasbourg France
17. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Nice; Nice France
18. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Grenoble; Grenoble France
19. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire d'Amiens; Amiens France
20. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Tours; Tours France
21. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Saint Etienne; Saint Etienne France
22. Department of Internal Medicine; French Reference Centre for Rare, Autoimmune and Systemic Diseases; Pitié -Salpêtrière Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
23. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Angers; Angers France
24. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Poitiers; Poitiers France
25. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Rennes; Rennes France
26. Department of Neuroradiology; Pitié -Salpêtrière Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
27. INSERM; UMR-S1147; CNRS SNC5014; Paris Descartes University; Equipe labellisée Ligue Nationale contre le cancer; Paris France
28. Pathology Department; Ambroise Paré Hospital; Assistance Publique-Hôpitaux de Paris; Boulogne-Billancourt France
29. Department of Neurology; Pitié -Salpêtrière Hospital; Assistance Publique-Hôpitaux de Paris; Paris France