title: Controlled drinking by chronic alcoholics over extended periods of free access.
mesh_terms: D000328:Adult; D000428:Alcohol Drinking; D000437:Alcoholism / Q000628:therapy*; D000431:Ethanol; D006801:Humans; D008297:Male; D008875:Middle Aged; D012054:Reinforcement, Psychology; D013997:Time Factors
chemical_list: D000431:Ethanol