- Have the diagnosis of epilepsy with partial-onset seizures with or without secondarily generalized seizures according to the International League Against Epilepsy's Classification of Epileptic Seizures (1981). Diagnosis should have been established by clinical history, electroencephalogram (EEG) and computed tomography/magnetic resonance imaging (CT/MRI) of the brain performed within the last 10 years and consistent with localization-related epilepsy.