title: Placebos and common factors in two decades of psychotherapy research.
authors.forename: P
authors.initials: P
authors.lastname: Horvath
mesh_terms: D006801:Humans; D001523:Mental Disorders / Q000628:therapy*; D010919:Placebos / Q000627:therapeutic use*; D011379:Prognosis; D011613:Psychotherapy / Q000379:methods*
chemical_list: D010919:Placebos