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APA Citation
Holthusen, H., Backhaus, P., Boeminghaus, F., Breulmann, M., & Lipfert, P. (2002). preemptive Analgesia: No Relevant Advantage of Preoperative Compared With Postoperative Intravenous Administration of Morphine, Ketamine, and Clonidine In Patients Undergoing Transperitoneal Tumor Nephrectomy. Regional anesthesia and pain medicine, 27(3), 249–253. http://access.bl.uk/ark:/81055/vdc_100135541162.0x00001f