title: [Drug efficacy test for angina pectoris,--not one-time but two-times cross-over].
mesh_terms: D000787:Angina Pectoris / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004341:Drug Evaluation / Q000379:methods; D006801:Humans; D010919:Placebos
chemical_list: D010919:Placebos