CHMP7 and attention deficit-hyperactivity disorder: The first SNP is an intronic variant in the MYT1L gene found to be associated with adult ADHD (reported p = 8.00E-06), while the second SNP is an intronic one in the CHMP7 gene and was noted in a meta-analysis of ADHD in children (reported p = 3.00E-06) [16, 21].