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Abbreviations.
| ADHD | attention deficit/hyperactivity disorder |
| ADHD–HI | ADHD–hyperactive/impulsive subtype |
| DAT | dopamine transporter |
| DRD4-7R | seven-repeat allele of dopamine receptor type D4 |
| 5HTT | 5HT (serotonin) transporter |
| SDQ | strengths and difficulties questionnaire |
| SNAP-25 | synaptosome-associated protein of 25 kD |
