An overview of spinal opioids in pain management.
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D015360:Analgesia, Epidural / Q000009:adverse effects / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects; D006801:Humans; D010146:Pain / Q000188:drug therapy*
D000701:Analgesics, Opioid