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Richarz, U. et al. (2013). Sustained Safety and Efficacy of Once‐Daily Hydromorphone Extended‐Release (OROS® hydromorphone ER) Compared with Twice‐Daily Oxycodone Controlled‐Release Over 52 Weeks in Patients with Moderate to Severe Chronic Noncancer Pain. Pain practice. 13 (1), pp. 30-40. [Online].