Sampling standards
cognitive impairment
HEARING IMPAIRMENT
Inclusion criteria: ① MS patients diagnosed in a cross-sectional study; ② 18 years old and above; ③ permanent population (residential time more than 6 months per year); ④ ability to communicate normally and have basic literacy skills (Exclusion criteria: ① pregnant women; ② hearing impairment; ③ inability to communicate normally; ④ having cognitive impairment or mental illness.