Efficacy and harms of long‐term opioid therapy in chronic non‐cancer pain: Systematic review and meta‐analysis of open‐label extension trials with a study duration ≥26 weeks
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2017 ◽
Vol 26
(8)
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pp. 1955-1967
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2020 ◽
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2021 ◽
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2020 ◽
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