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A 37-year-old woman comes to you for recurrent episodes of double vision and drooping of her eyelids for the last month. Such episodes occur, last for hours, and resolve spontaneously. She also repos occasional hoarseness, which also come and go. Vital signs and physical examination are normal. Most appropriate next step in diagnosis is?

ABlood, urine, and CSF analysis
BMRI of the head
CEEG recording
DElectromyography under repetitive stimulation
Medicine
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