title: The William Nelson ECG Quiz.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000503:physiopathology; D001283:Atrioventricular Node / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D013997:Time Factors