NFE2L2 and attention deficit-hyperactivity disorder: The GSH, SIRT1, Nrf2, and HO-1 levels declined in the ADHD model group versus the control group; however, the ADHD/HSP-25 and ADHD/HSP-50 groups showed enhanced SIRT1, Nrf2, and HO-1 levels versus the ADHD model group.