Immunology / Magnetic Resonance Imaging / Humans / Corpus Callosum / Systemic Lupus Erythematosus / Female / Male / Arthritis / Clinical Sciences / Atrophy / Adult / Public health systems and services research / Time Factors / Glucocorticoids / Brain Diseases / Female / Male / Arthritis / Clinical Sciences / Atrophy / Adult / Public health systems and services research / Time Factors / Glucocorticoids / Brain Diseases