Severity of patients' psychopathology was assessed with Brief Psychiatric Rating Scale (BPRS), which measures 24 symptoms of psychiatric disease and is validated in Dutch 20. Extrapyramidal symptoms were assessed with the St. Hans Ratings Scale (SHRS), which is a multidimensional rating scale for the evaluation of hyperkinesia, parkinsonism, akathisia and dystonia induced by neuroleptics. The dyskinesia is scored in two situations: in passive and active circumstances.