The origins of the electrocardiograph as a clinical instrument.
D004562:Electrocardiography / Q000266:history* / Q000295:instrumentation; D005060:Europe; D049670:History, 17th Century; D049672:History, 19th Century; D049673:History, 20th Century; D013677:Medical Laboratory Science / Q000266:history; D010827:Physiology / Q000266:history / Q000295:instrumentation; D006113:United Kingdom