The origins of anesthesia.
D000758:Anesthesia / Q000266:history*; D000776:Anesthesiology / Q000266:history; D006115:Greece; D049668:History, 15th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D009892:Opium; D010207:Papaver; D010946:Plants, Medicinal; D010947:Plants, Toxic
D009892:Opium