Multigroup diagnostic classification with a new 'maximal' lead system.
D000328:Adult; D000787:Angina Pectoris / Q000175:diagnosis*; D006332:Cardiomegaly / Q000175:diagnosis*; D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*