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.
 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
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 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