Neuromyelitis optica testing and treatment: Availability and affordability in 60 countries.

Background: We characterize the variations in availability and affordability of NMO diagnostic testing and treatment by geographic region and country-level income group.

Methods: A structured survey was distributed in English, French, and Spanish in late 2018 to neurologists and other physicians who encounter NMO patients.

Results: Respondents (response rate 45%, 64/143 countries contacted) came from all WHO world regions and World Bank country income levels (49% university-based; 13 low-, 16 lower middle-, 16 upper-middle-, and 15 high-income countries).