This study aims to evaluate different non-invasive and neuromuscular stimulation treatments for neurogenic dysphagia in post-stroke and Parkinson's disease patients. The study is divided into three sub-studies: 1. Unilateral, bihemispheric, or sham transcranial Direct Current Stimulation (tDCS) in post-stroke dysphagia (patients ≥2 weeks from onset). 2. Bihemispheric or sham tDCS in Parkinson's disease-related dysphagia. 3. Neuromuscular stimulation therapy in post-stroke and Parkinson's disease dysphagia.
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Dysphagia Outcome and Severity Scale (DOSS) score
Timeframe: At baseline and 6 weeks post-treatment