Attention-deficit/hyperactivity disorder and sluggish cognitive tempo throughout childhood: temporal invariance and stability from preschool through ninth grade.
Leopold DR, Christopher ME, Burns GL, Becker SP, Olson RK, Willcutt EG. Attention-deficit/hyperactivity disorder and sluggish cognitive tempo throughout childhood: temporal invariance and stability from preschool through ninth grade. J Child Psychol Psychiatry. 2016 09; 57(9):1066-74.