Prevalence and Incidence of Neuromyelitis Optica Spectrum Disorder in Korea: Population Based Study

BACKGROUND Although neuromyelitis optica spectrum disorder (NMOSD) is known to be a rare disease, its prevalence and incidence have not yet been studied in Korea. We performed a population-based study to examine the prevalence and incidence of NMOSD in Korea using data from the Korean National Health Insurance (NHI) claims database. METHODS Data from 2013 to 2017 were obtained, with a washout period set as 2013 and 2014. The prevalence and...