Corrigendum to “A pilot study comparing treatments for severe attacks of neuromyelitis optica spectrum disorders: Intravenous methylprednisolone (IVMP) with add-on plasma exchange (PLEX) versus simultaneous ivmp and PLEX” [Multiple Sclerosis and Related Disorders (2020) 1;38:101506] (Multiple Sclerosis and Related Disorders (2020) 38, (S221103481930495X), (10.1016/j.msard.2019.101506))
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