Analgesic methodology: a brief history and commentary.
D000700:Analgesics / Q000009:adverse effects / Q000266:history*; D000818:Animals; D002908:Chronic Disease; D004341:Drug Evaluation; D049673:History, 20th Century; D006801:Humans; D009294:Narcotics; D010146:Pain / Q000503:physiopathology; D010352:Patient Dropouts; D012107:Research Design
D000700:Analgesics; D009294:Narcotics