1. Reference Centre for Sickle Cell Disease, Department of General Pediatrics and Pediatric Infectious Diseases Necker‐Enfants malades Hospital, Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
2. Centre of Excellence in Rare Hematological Disease‐Hemoglobinopathies, Laiko General Hospital Athens Greece
3. Department of Pediatric Oncology & Hematology Charité University Medicine, Berlin and Berlin Institute of Health Berlin Germany
4. Hospices Civils de Lyon, Hôpital Edouard Herriot, Médecine Interne, Centre de Référence Constitutif: Syndromes Drépanocytaires Majeurs, Thalassémies et Autres Pathologies Rares du Globule Rouge et de l'Erythropoïèse Lyon France
5. Sickle Cell Referral Center, Department of Internal Medicine Henri‐Mondor University Hospital‐UPEC, AP‐HP Créteil France
6. Centre hospitalier de la Martinique Fort‐de‐France Martinique France
7. Biotherapy Department Necker Children's Hospital, Assistance Publique‐Hôpitaux de Paris Paris France
8. Department of Woman's and Child's Health University of Padua Padua Italy