1 Child and Adolescent Psychiatry Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge, CB2 0QQ, UK; School of Medicine, University of Nottingham, NG7 2RD, UK; Centre for ADHD and Neurodevelopmental Disorders Across the Lifespan, Institute of Mental Health, University of Nottingham, Nottingham, NG72TU, UK Tel.: +44 01480 415300; fax: +01480 415363/393.. Electronic address: Samuele.cortese@gmail.com.