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Prevalence of safe swallowing and penetration (PAS score) and oral and pharyngeal residues for three bolus viscosities (<50 mPa·s, 120 mPa·s, and 4000 mPa·s) in the OFF and ON states. OFF p-values * <0.05 and ** <0.01; ON p-values * <0.05 and *** <0.001.
