A research team led by the University of Iowa has reported the frequency of two muscle-weakness disorders that strike mostly boys- Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy. Researchers found that about 1 in 5,000 boys, between 5 and 9 years old, have the inherited disorders. They also found that the diseases appear to affect Hispanic boys more often than white or African-American boys, for reasons that are not well understood. The findings ...
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