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Dysphagia limit and patient with Parkinson’s disease (PD). Note that the water volume swallowed at one time can go up to 20 mL of water in a PD patient without dysphagia (A), whereas in a PD patient with dysphagia (B), the bolus is divided into two or more separate swallows during swallowing of 10–20 mL of water. Arrows denote the second and subsequent swallows[12].
