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Dysphagia limit (DL). (A) is a normal adult subject, and DL is normal. (B) is a patient with dysphagia with stroke. DL is 10 mL and pathological. (C) is an amyotrophic lateral sclerosis (ALS) patient without dysphagia, and DL is normal. (D) is an ALS patient with dysphagia, and DL is 5 mL and pathological[55,65].
