title: Clozapine alone versus clozapine and risperidone for refractory schizophrenia.
authors.forename: Guido
authors.initials: G
authors.lastname: Grass
authors.forename: Martin
authors.initials: M
authors.lastname: Hellmich
authors.forename: F Markus
authors.initials: FM
authors.lastname: Leweke
mesh_terms: D014150:Antipsychotic Agents / Q000627:therapeutic use*; D003024:Clozapine / Q000627:therapeutic use*; D016001:Confidence Intervals; D004359:Drug Therapy, Combination; D006801:Humans; D018967:Risperidone / Q000627:therapeutic use*; D012559:Schizophrenia / Q000188:drug therapy*
chemical_list: D014150:Antipsychotic Agents; D003024:Clozapine; D018967:Risperidone