A 6-year-old girl is found to have a blood pressure of 130/75 mm Hg. She was born prematurely at 32 weeks' gestation and required ventilation. There is a family history of hypertension in 3 grandparents. Clinical examination reveals a grade 1/6 mid-systolic murmur, no renal bruits, and femoral pulses are difficult to feel. Which one of the following is the most likely diagnosis?
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