Department of rheumatology, North hospital, university hospital of Saint-Étienne, avenue Albert-Raimond, 42270 Saint-Priest-en-Jarez, France; SAINBIOSE, Inserm U1059, university of Lyon, 42023 Saint-Étienne, France; CIC Inserm U1408, university of Lyon, 42023 Saint-Étienne, France. Electronic address: