Study Limitations
chronic swallowing disorders
DISEASE COURSE
The limitations of this study are as follows. First, only 40 patients were included, and their disease course was within 3 months. Patients with chronic swallowing disorders were not included. The small sample size makes it hard to draw general conclusions. Second, the follow-up time was 3 months, which was not sufficient for the analysis of the microstructure of the brain to corroborate the findings. Third, in this study, we did not set a sham tDCS stimulation group to ensure the reliability of the study results. Fourth, the SSA/PSA assessors were not blinded during the study, which may have affected the study results.