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Seventy-four per cent of patients with epileptogenic disorders seen at the Emergency Unit at Groote Schuur Hospital were on phenytoin and 11.6% of these had blood levels in the toxic range.
 ( adverse event: had ,  Seventy-four per cent of patients with epileptogenic disorders: Subject, 11.6% of these: Subject, Seventy-four per cent: Subject.Population, 11.6%: Subject.Population, blood levels in the toxic range: Effect, phenytoin: Treatment, phenytoin: Treatment.Drug, epileptogenic: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: had ,  Seventy-four per cent of patients with epileptogenic disorders: Subject, 11.6% of these: Subject, Seventy-four per cent: Subject.Population, 11.6%: Subject.Population, blood levels in the toxic range: Effect, phenytoin: Treatment, phenytoin: Treatment.Drug, epileptogenic: Treatment.Disorder) 