HMGA2 and attention deficit-hyperactivity disorder: MiRNA targets: We tested the association between ADHD and tagSNPs covering 3′-UTRs of 10 experimentally validated target genes for miR-34b and/or miR-34c (BCL2, CREB1, CRHR1, HMGA2, JAG1, MET, NOTCH1, NOTCH2, NOTCH3 and VEGFA).