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Sprague-Dawley rats from two different vendors, Möllegård, Denmark and B&K Universal, Sweden, have been tested for the antinociceptive effect of morphine, methadone, buprenorphine and codeine on the(More)
BACKGROUND Neuropathic pain after injury to the nervous system is a difficult clinical problem. Sex differences in the development of neuropathic pain have not been well established experimentally or(More)
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