1 Department of General Paediatrics, Paediatric Internal Medicine, Rheumatology and Infectious Diseases, Hôpital Robert Debré, Assistance Publique des Hôpitaux de Paris (AP-HP), Paris, France; ECEVE INSERM UMR 1123, Paris, France; Université Paris Cité, Paris, France. Electronic address: albert.faye@aphp.fr.