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Co‐morbidity in persistent opioid users with chronic non‐malignant pain in Norway

In patients with chronic non‐malignant pain (CNMP), co‐morbid physical or mental health disorders are common and may have a negative impact on health‐related quality of life and treatment outcomes. The purpose of this study was to examine the occurrence of chronic psychiatric and somatic diseases in persistent opioid users with CNMP compared with the general population in Norway.