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MedÂline Plus. 2020. USA. -
National InsiÂtute of NeuÂroÂlogÂiÂcal DisÂorÂders and Stroke. 2023. USA. -
AmerÂiÂcan Syringomyelia & Chiari Alliance Project, Inc. USA. -
AmerÂiÂcan Syringomyelia and Chiari Alliance Project. 2020. USA.