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Percentage of patients who could swallow safely vs. those that cannot swallow safely comparing three groups together against HNC. Left: older, Parkinson’s and stroke patients; right: patients with head and neck cancer. * p-value <0.05, ** <0.01, *** <0.001, **** <0.001. ‡ p-value <0.05 Older + Parkinson’s + Stroke. HNC: Head and neck cancer.
