Prevalence of autoimmune comorbidities in aquaporin 4-immunoglobulin G positive neuromyelitis optica spectrum disorder: a systematic review and meta-analysis.
BACKGROUND Autoimmune comorbidities in aquaporin-4-immunoglobulin G (AQP4-IgG)-positive neuromyelitis optica spectrum disorder (NMOSD) may be associated with increased disease severity and therapeutic challenges, yet prevalence estimates vary considerably. Some variability may reflect differences in population characte...