title: Electrocardiogram by Einthoven 63 years earlier.
mesh_terms: D000368:Aged; D004562:Electrocardiography / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D012804:Sick Sinus Syndrome / Q000628:therapy