title: Placebo responsiveness--influence of previous therapy.
mesh_terms: D000328:Adult; D000368:Aged; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos / Q000494:pharmacology*; D044469:Racial Groups; D012737:Sex Factors
chemical_list: D010919:Placebos