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2) Imanaka K, Tominaga Y, Etropolski M, et al. Ready conversion of patients with well‒con trolled, moderate to severe, chronic malignant tumor‒related pain on other opioids to tapen tadol extended release. Clin Drug Investig 2014;34:501‒11 3) Kress HG, Koch ED, Kosturski H, et al. Tapentadol prolonged release for managing moderate to severe, chronic malignant tumor‒related pain. Pain Physician 2014;17:329‒43