Department of Immunology, CIC1408, GIMAP EA3064, Université Jean Monnet, Saint Étienne, France. Department of Rheumatology, SAINBOISE AINBIOSE INSERM 1059, University of Lyon, Saint-Étienne, France. Division of Rheumatology, Allergy & Immunology, University of California San Diego School of Medicine, La Jolla, California, USA. Department of Rheumatology, University Hospital of Tours, EA 7501, Tours, France. Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway. UCB Pharma, Brussels, Belgium. Department of Medicine, University of California San Diego, La Jolla, California, USA.