GSTM1 and attention deficit-hyperactivity disorder: The comparison between ADHD and control subjects revealed significant activation of oxy-Hb signal in the right CHs 6 and 10 in the control subjects (independent two-sample t-test; R CHs 6, p < 0.05 Bonferroni-corrected, Cohen's d = 0.964; R CHs 10, p < 0.05 Bonferroni-corrected, Cohen's d = 0.699).