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Stamer, Ulrike M; Stüber, Frank; Muders, Thomas; Musshoff, Frank (2008). Respiratory depression with tramadol in a patient with renal impairment and CYP2D6 gene duplication. Anesthesia and analgesia, 107(3), pp. 926-9. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1213/ane.0b013e31817b796e
