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Flowchart of current pain conditions in AQP4-IgG-pos. NMOSD patients with and without a history of myelitis. AQP4-IgG-pos.: aquaporin-4-immunoglobulin-G-positive; n: number of patients; NMOSD: neuromyelitis optica spectrum disorder. *Others: connective tissue disease, arthralgia of unknown origin, vasculitis.
