Three-year predictive validity of DSM-IV attention deficit hyperactivity disorder in children diagnosed at 4-6 years of age.
Lahey BB, Pelham WE, Loney J, Kipp H, Ehrhardt A, Lee SS, Willcutt EG, Hartung CM, Chronis A, Massetti G. Three-year predictive validity of DSM-IV attention deficit hyperactivity disorder in children diagnosed at 4-6 years of age. Am J Psychiatry. 2004 Nov; 161(11):2014-20.