Letter: Prinzmetal's variant angina: spasm or organic coronary disease.
D000787:Angina Pectoris / Q000175:diagnosis / Q000209:etiology*; D003327:Coronary Disease / Q000150:complications*; D003331:Coronary Vessels; D003937:Diagnosis, Differential; D006801:Humans; D005082:Physical Exertion; D013035:Spasm / Q000150:complications; D013577:Syndrome