title: Placebo-controlled or active-controlled trials for variant angina pectoris?
authors.forename: D
authors.initials: D
authors.lastname: Ardissino
authors.forename: S
authors.initials: S
authors.lastname: Savonitto
mesh_terms: D000788:Angina Pectoris, Variant / Q000188:drug therapy*; D002986:Clinical Trials as Topic / Q000379:methods; D003692:Delayed-Action Preparations; D006801:Humans; D009543:Nifedipine / Q000627:therapeutic use*; D010919:Placebos; D012107:Research Design
chemical_list: D003692:Delayed-Action Preparations; D010919:Placebos; D009543:Nifedipine