1. French Sickle Cell Referral Center France
2. Internal Medicine Department, Georges Pompidou European Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
3. AP‐HP/Universities/Inserm COVID‐19 Research Collaboration Paris France
4. Internal Medicine Department, Tenon Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
5. Service de Biothérapie, Necker‐Enfants malades Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
6. Department of General Pediatrics and Pediatric Infectious Diseases, Necker‐Enfants Malades Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
7. Statistical unit Pérouges France
8. Pediatric Department, Centre Hospitalier de Mayotte Rue de l'hôpital Mayotte France
9. Internal Medicine Department Hospices Civils Lyon France
10. Internal Medicine Department IUCT Oncopole, CHU de Toulouse France
11. Pediatric Department, Bicetre Hospital, Bicêtre Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
12. Pediatric Department, Robert Debré Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
13. Pediatric Department, Hôpital Armand Trousseau Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
14. Department of Internal Medicine, Mondor Hospital Assistance Publique‐Hôpitaux de Paris (AP‐HP) Paris France
15. Unité Transversale de la Drépanocytose CHU de Guadeloupe Pointe à Pitre France