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Kaplan–Meier survival curves of time from the onset of NMOSD to an EDSS score of 4.0 or EDSS score of 6.0 in ANA (+) NMOSD patients (solid line) and ANA (−) NMOSD patients (dashed line). ANA, antinuclear antibody; EDSS, Kurtzke's Expanded Disability Status Scale; NMOSD, neuromyelitis optica spectrum disorder
