1. National Reference Center for Hypereosinophilic syndromes (CEREO) Suresnes France
2. Department of Internal Medicine Hôpital Foch Suresnes France
3. Department of Intensive Care medicine Centre Hospitalier Annecy Genevois Saint‐Julien‐en‐Genevois France
4. Clinical Research Department Hôpital Foch Suresnes France
5. Pole Hématologie et Oncologie Laboratoire CERBA Saint‐Ouen‐l'Aumône France
6. Laboratory of Hematology CHU de Bordeaux Pessac France
7. Department of Oncology Sainte‐Anne Military Teaching Hospital Toulon France
8. Laboratory of Hematology Saint‐Louis Hospital, University of Paris Paris France
9. Hematology Department CH Annecy Genevois Annecy France
10. National Coordinating Reference Center for Rare Pulmonary Diseases Louis Pradel Hospital Lyon France
11. Hospices Civils de Lyon, UMR754, University Claude Bernard Lyon 1 Lyon France
12. Laboratory of Hematology Institut Universitaire du Cancer de Toulouse Oncopole, CHU de Toulouse Toulouse France
13. Aix Marseille University, Department of Internal Medicine Hôpital de la Timone, AP‐HM, CNRS, INSERM, CIML Marseille France
14. Department of Internal Medicine CHU Saint Antoine Paris France
15. Laboratory of Hematology Hôpital Nord, CHU de Saint‐Étienne Saint‐Étienne France
16. Department of Clinical Immunology Saint Louis hospital Paris France
17. Laboratoire de cytogénétique hématologique CHU de Nantes Nantes France
18. Laboratory of Hematology CHU de Lille Lille France
19. Department of Clinical Immunology and Internal Medicine, National Reference Center for Systemic Autoimmune Diseases (RESO), Tertiary Center for Primary Immunodeficiency Strasbourg University Hospital Strasbourg France
20. Department of Internal Medicine CHU de Nantes Nantes France
21. CRCINA CHU d'Angers Angers France
22. Department of Hematology Saint Louis hospital Paris France
23. Department of Hematology CHU Pontchaillou Rennes France
24. University of Paris, Institut National de Recherche Médicale U1151 Laboratory of Onco‐Hematology, Hôpital Necker Enfants‐Malades Paris France
25. Department of Internal Medicine CHU de Bordeaux Bordeaux France
26. Université de Strasbourg, INSERM U1113 Interface de Recherche Fondamentale et Appliquée en Cancérologie, Laboratoire d'hématologie du CHRU Strasbourg, Faculté de Médecine de Strasbourg Strasbourg France
27. Service d'Hématologie Oncologie, CHU Groupe Hospitalier Sud Réunion Saint Pierre, Reunion France
28. Institut Paoli‐Calmettes, Centre de Recherche en Cancérologie de Marseille, Biopathologie Marseille France
29. Laboratory of Hematology CHU Caen Caen France
30. Department of Hematology INSERM U 1052, CRCL, Centre Léon Bérard Lyon France
31. Department of Hematology Institut Paoli‐Calmettes Marseille France
32. Hematology Department Versailles André Mignot Hospital, University Paris‐Saclay Le Chesnay France
33. Service d'Hématologie, Institut Universitaire du Cancer de Toulouse‐Oncopole Centre Hospitalier Universitaire de Toulouse Toulouse France
34. Université de Lille, CHU Lille, Département de Médecine Interne et Immunologie Clinique, Centre de Référence des Maladies Auto‐immunes Systémiques Rares du Nord et Nord‐Ouest de France (CeRAINO) Lille France
35. Université Paris‐Saclay, Department of Internal Medicine Ambroise Paré hospital, Boulogne Billancourt Cedex France