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The preoperative application of an epidural combination of ropivacaine, sufentanil, clonidine and ketamine does not provide preemptive analgesia: 107.

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Gottschalk A, Freitag M, Steinacker E, et al
The preoperative application of an epidural combination of ropivacaine, sufentanil, clonidine and ketamine does not provide preemptive analgesia: 107.
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December 17, 2018

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