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Zolpidem/zopiclone (Z-drugs) and benzodiazepines (BDZs) have different profiles of comorbidity, but studies have seldom explored these differences. This study examined psychiatric comorbidity in patients dependent on Z-drugs or BDZs attending substance abuse clinics in Hong Kong. In this retrospective chart review, the medical records of 207 patients (117 on Z-drugs and 90 on BDZs) treated between...
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