Endogenous opioids and pain: status of human studies and new treatment concepts.
Frederickson
R C
RC
Chipkin
R E
RE
D000698:Analgesia; D004723:Endorphins / Q000008:administration & dosage / Q000502:physiology* / Q000627:therapeutic use; D006801:Humans; D007278:Injections, Spinal; D010146:Pain / Q000188:drug therapy* / Q000378:metabolism; D011957:Receptors, Opioid / Q000187:drug effects / Q000502:physiology*
D004723:Endorphins; D011957:Receptors, Opioid