Attention-deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder that affects 3–7% of children (Wilens 2004). Prospective longitudinal studies show persistence of the disorder in 10–20% of adults diagnosed with ADHD in childhood, and a further 40–60% of patients experience partial remission, with persistence of some symptoms and significant clinical impairments (Barkley 2008). P...