title: The amotivational syndrome hypothesis and the Costa Rica study: relationships between methods and results.
mesh_terms: D002186:Cannabinoids / Q000009:adverse effects*; D003364:Costa Rica; D004651:Employment; D006801:Humans; D002189:Marijuana Abuse / Q000453:epidemiology / Q000523:psychology*; D009042:Motivation / Q000187:drug effects*; D012107:Research Design; D013577:Syndrome
chemical_list: D002186:Cannabinoids