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| Methods | Allocation: randomised. Blindness: double‐blind. Duration: six weeks. Setting: inpatients, Israel. Design: cross‐over. |
| Participants | Diagnosis: schizophrenia. N = 22. Sex: 11 F, 11 M. Age: average 64 years. History: tardive dyskinesia. |
| Interventions | 1. Melatonin (10 mg/day). N = 10.
2. Placebo. N = 12. Stable antipsychotic: "regular regimen". |
| Outcomes | Unable to use any data (only cross‐over reported) |
| Notes |
