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A Trial by Trial Analysis Reveals More Intense Physical Activity is Associated with Better Cognitive Control Performance in Attention-Deficit/Hyperactivity Disorder Behavioral and cognitive effects of tyrosine intake in healthy human adults Effect of vitamin D supplementation as adjunctive therapy to methylphenidate on ADHD symptoms: A randomized, double blind, placebo-controlled trial Neurochem Res doi: 10.1007/s11064-005-8826-8