1294
A 7-year-old boy developed a severe unilateral grand mal seizure at the age of 5 years (phenobarbitone therapy); 1.5 years later valproate (2-propylpentanoic acid, VPA) was added to the therapy.
 ( potential therapeutic event: therapy.,  A 7-year-old boy developed a severe unilateral grand mal seizure: Subject, 7-year-old: Subject.Age, boy: Subject.Gender, a severe unilateral grand mal seizure: Subject.Disorder, at the age of 5 years (phenobarbitone therapy); 1.5 years later valproate (2-propylpentanoic acid, VPA) was added to the therapy.: Treatment, phenobarbitone: Treatment.Drug, valproate: Treatment.Drug, 1.5 years later: Treatment.Time_elapsed, valproate: Combination.Drug, phenobarbitone: Combination.Drug) 
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:
 ( potential therapeutic event: therapy.,  A 7-year-old boy developed a severe unilateral grand mal seizure: Subject, 7-year-old: Subject.Age, boy: Subject.Gender, a severe unilateral grand mal seizure: Subject.Disorder, at the age of 5 years (phenobarbitone therapy); 1.5 years later valproate (2-propylpentanoic acid, VPA) was added to the therapy.: Treatment, phenobarbitone: Treatment.Drug, valproate: Treatment.Drug, 1.5 years later: Treatment.Time_elapsed, valproate: Combination.Drug, phenobarbitone: Combination.Drug) 