MIR9-2HG and attention deficit-hyperactivity disorder: Notably, the largest GWAS meta‐analysis to date performed in ADHD has reported 12 genome‐wide significant loci (p < 5E‐08), which span several long noncoding RNA sequences, such as KDM4A‐AS1,LINC02497,LINC02060,TMEM161B‐AS1,LINC01288,LINC01572,MEF2C‐AS1,and LINC00461.13