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. Pathology Department; Ambroise Paré Hospital; Assistance Publique-Hôpitaux de Paris; Boulogne-Billancourt France
5. Laboratory of Haematology; Trousseau Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
6. INSERM UMR-S1147; CNRS SNC 5014; Université Paris Sorbonne Cité; Paris France
7. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Toulouse; Toulouse France
8. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Bordeaux; Bordeaux France
9. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Grenoble; Grenoble France
10. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Nice; Nice France
11. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Tours; Tours France
12. Department of Paediatric Immunology; Haematology and Rheumatology; Necker Hospital, Assistance Publique-Hôpitaux de Paris; Paris France
13. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire d'Amiens; Amiens France
14. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Strasbourg; Strasbourg France
15. Department of Paediatric Haematology and Oncology; Centre Hospitalo-Universitaire de Nantes; Nantes France
16. Department of Paediatric; Hôpital Arnaud de Villeneuve; Montpellier France