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Patients who satisfied the following inclusion criteria were invited to participate in the study: 1) age 18–60 years; 2) men and women with a DSM-IV diagnosis of schizophrenia; 3) inpatients of psychosis wards; 4) had been treated with a stable dose of oral antipsychotic mono-therapy for at least four weeks before entry into the study, irrespective of the presence or absence of combination use of other non-antipsychotic drugs.
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