An understanding of pain and its measurement.
D002986:Clinical Trials as Topic; D006801:Humans; D008728:Methotrimeprazine / Q000628:therapy*; D009020:Morphine / Q000627:therapeutic use*; D010146:Pain / Q000188:drug therapy* / Q000503:physiopathology*
D009020:Morphine; D008728:Methotrimeprazine