title: A randomized study on oral administration of morphine and methadone in the treatment of cancer pain.
mesh_terms: D000284:Administration, Oral; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D008297:Male; D008691:Methadone / Q000008:administration & dosage / Q000627:therapeutic use*; D009020:Morphine / Q000008:administration & dosage / Q000627:therapeutic use*; D009369:Neoplasms / Q000503:physiopathology*; D010148:Intractable Pain / Q000188:drug therapy*; D011897:Random Allocation
chemical_list: D009020:Morphine; D008691:Methadone