1 Assistance publique-hôpitaux de Paris, Hospital Cochin, université Paris 5-René-Descartes, National Referral Center for Rare Autoimmune and Systemic Diseases, Department of Internal Medicine, Inserm U1060, 75679 Paris cedex 14, France.
2 Assistance publique-hôpitaux de Paris, Hospital Cochin, université Paris 5-René-Descartes, National Referral Center for Rare Autoimmune and Systemic Diseases, Department of Internal Medicine, Inserm U1060, 75679 Paris cedex 14, France. Electronic address: loic.guillevin@cch.aphp.fr.