title: Contingency contracting with drug abusers in the natural environment.
mesh_terms: D001521:Behavior Therapy / Q000379:methods*; D003710:Demography; D005431:Florida; D006801:Humans; D010348:Patient Care Team; D010561:Personnel Staffing and Scheduling; D019966:Substance-Related Disorders / Q000628:therapy*; D014838:Volunteers