title: Variants of variance.
mesh_terms: D000787:Angina Pectoris; D000788:Angina Pectoris, Variant / Q000150:complications / Q000503:physiopathology; D001158:Arteries / Q000503:physiopathology; D001161:Arteriosclerosis / Q000150:complications; D003331:Coronary Vessels / Q000503:physiopathology; D013035:Spasm / Q000503:physiopathology