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The cases are important in documenting that drug-induced dystonias do occur in patients with dementia, that risperidone appears to have contributed to dystonia among elderly patients, and that the categorization of dystonic reactions needs further clarification.
 patients with dementia: Subject; elderly patients: Subject; dementia: Subject.Disorder; elderly: Subject.Age; dystonia: Effect; risperidone: Treatment; risperidone: 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: 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:
 patients with dementia: Subject; elderly patients: Subject; dementia: Subject.Disorder; elderly: Subject.Age; dystonia: Effect; risperidone: Treatment; risperidone: Treatment.Drug