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A 6-year-old boy (weight: 16 kg, at the start of treatment) began sodium valproate (valproate syrup 5%) treatment for epilepsy in February 2012.
 A 6-year-old boy (weight: 16 kg, at the start of treatment): Subject; 6-year-old: Subject.Age; boy: Subject.Gender; sodium valproate (valproate syrup 5%): Treatment; epilepsy: Treatment.Disorder; sodium valproate: Treatment.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 6-year-old boy (weight: 16 kg, at the start of treatment): Subject; 6-year-old: Subject.Age; boy: Subject.Gender; sodium valproate (valproate syrup 5%): Treatment; epilepsy: Treatment.Disorder; sodium valproate: Treatment.Drug