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Niacin causes a reversible toxic cystoid maculopathy that occurs in approximately 0.67% of patients taking high doses of the drug.
 approximately 0.67% of patients: Subject; 0.67%: Subject.Population; reversible toxic cystoid maculopathy: Effect; Niacin: Treatment; high doses: Treatment; Niacin: Treatment.Drug; high doses: Treatment.Dosage
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 approximately 0.67% of patients: Subject; 0.67%: Subject.Population; reversible toxic cystoid maculopathy: Effect; Niacin: Treatment; high doses: Treatment; Niacin: Treatment.Drug; high doses: Treatment.Dosage