title: Placebo effect of medication cost in Parkinson disease: a randomized double-blind study.
authors.forename: John M
authors.initials: JM
authors.lastname: Kelley
mesh_terms: D000978:Antiparkinson Agents / Q000008:administration & dosage* / Q000191:economics*; D005260:Female; D006801:Humans; D008297:Male; D010300:Parkinson Disease / Q000188:drug therapy* / Q000191:economics*; D015990:Placebo Effect
chemical_list: D000978:Antiparkinson Agents