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M ental retardation (MR) occurs in 2–3% of the general population, and more than half of MR patients are categorised as idiopathic—that is, the cause is unknown. 1 2 Patients with idiopathic MR are presumed to be affected with certain genetic disorders or undetectable chromosomal abnormalities. MR may also be caused by environmental factors independently or(More)
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