| http://www.w3.org/ns/prov#value | - 23 Preterm birth complicated by susceptibility to cerebral ischemia may contribute to increased dopamine receptor availability, deficient dopaminergic neurotransmission, and subsequent development of ADHD.24 Evidence of environmental mediators in ADHD has been demonstrated in twin studies, with affected twins having greater exposure to risk factors such as maternal smoking, lower birth weights, an
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