Letter: ECG change during exercise.
D000787:Angina Pectoris / Q000175:diagnosis; D017023:Coronary Angiography; D003327:Coronary Disease / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003951:Diagnostic Errors; D004562:Electrocardiography / Q000592:standards; D005080:Exercise Test / Q000592:standards; D006801:Humans