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| Methods | Allocation: randomised ‐ divided into 3 groups randomly Blindness: not mentioned, assume open‐label |
| Participants | Diagnosis: people with chronic schizophrenia, residual type according to DSM‐III‐R and had predominant negative symptoms evaluated by PANSS |
| Interventions | Haloperidol + carbamazepine or haloperidol + valproate or haloperidol only |
| Outcomes | Mental states: BPRS, PANSS, CGI Depression: HRDS Adverse events: SAS |
| Notes |
