title: Treatment outcome as a function of follow-up difficulty in substance abusers.
mesh_terms: D000328:Adult; D000368:Aged; D000437:Alcoholism / Q000534:rehabilitation; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012917:Social Adjustment; D019966:Substance-Related Disorders / Q000534:rehabilitation*