title: Willem Einthoven Memorial Symposium on Developments in Electrocardiography 1927-1977, Leiden, The Netherlands, 28 October 1977. Introduction.
mesh_terms: D004562:Electrocardiography / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009426:Netherlands