title: Long-term effects of a simple contingency management program with chronic psychiatric patients.
mesh_terms: D000328:Adult; D001521:Behavior Therapy / Q000379:methods*; D002908:Chronic Disease; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000628:therapy*; D008875:Middle Aged; D012201:Reward; D014040:Token Economy