GRM6 and attention deficit-hyperactivity disorder: Ten genetic variants from 6 GluR genes [GRM5 (rs905646 & rs11020772), GRM6 (rs762724 & rs2067011), GRM7 (rs3792452 & rsrs3749380), GRIN2A (rs2229193), GRIN2B (rs2284411), GRIA1 (rs1422884 & rs2195450)] were analyzed in a group of ADHD probands, their parents, and ethnically matched control subjects; details on the genetic variants are provided in Supplementary Table S1).