Evaluation of Plasma Vitamin C Levels in a Population of Chronic Rheumatism in Immuno-Rheumatology

A protocol-specific blood test wil assess the vitamin C level in plasma

Several questionnaire will be completed by patients to evaluate quality of life: Analog and visual scale (EVA) pain, Neuropathic pain (DN) 4 questionnaire, EVA fatigue, Short Form (SF) 12 questionnaire and Hospital Anxiety and Depression scale (HAD questionnaire)