title: Placebo response in Parkinson trials using patient diaries: sites do matter.
authors.forename: William G
authors.initials: WG
authors.lastname: Ondo
mesh_terms: D000978:Antiparkinson Agents / Q000009:adverse effects / Q000627:therapeutic use*; D003710:Demography; D004305:Dose-Response Relationship, Drug; D006801:Humans; D010300:Parkinson Disease / Q000188:drug therapy*; D015990:Placebo Effect; D012642:Selegiline / Q000009:adverse effects / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D000978:Antiparkinson Agents; D012642:Selegiline