No detail description in article. Files of current patients with SMEI at participating centers were reviewed by a panel of experts who selected those who fulfilled the following criteria: no history of acquired brain injury; normal cognitive and motor development before seizure onset; onset of febrile or afebrile seizures, generalized or unilateral, before age one year; myoclonic jerks; intractable epilepsy; psychomotor delay within two years of seizure onset; normal MRI results in the first year of the seizure disorder; and a minimum follow-up of three years(Nabbout R, et al. Neurology. 2003 Jun 24; 60(12): 1961-7. [12821740]).