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A 24-year-old man complained of instability of his feet since the age of 16 years. From the age of 19 years onwards, he could no longer stand on tiptoe, and he experienced difficulties when playing basketball. At 20 years of age, his calves appeared to be thin. Gradually, he had some difficulty running, whereas he could climb the stairs and rise from a chair normally. He had no symptoms in his arms. The parents did not have similar problems.
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