title: The use and usefulness of placebo controls.
authors.forename: D S
authors.initials: DS
authors.lastname: Ramsay
authors.forename: S C
authors.initials: SC
authors.lastname: Woods
mesh_terms: D000978:Antiparkinson Agents / Q000627:therapeutic use; D003214:Conditioning, Classical; D018849:Controlled Clinical Trials as Topic; D004298:Dopamine / Q000378:metabolism; D006801:Humans; D010300:Parkinson Disease / Q000188:drug therapy; D015990:Placebo Effect; D010919:Placebos
chemical_list: D000978:Antiparkinson Agents; D010919:Placebos; D004298:Dopamine