title: Serendipity.
authors: Myrvin H
authors: MH
authors: Ellestad
mesh_terms: D035843:Biomedical Research / Q000266:history*; D002309:Cardiology / Q000266:history*; D003935:Diagnostic Techniques, Cardiovascular / Q000266:history*; D006331:Heart Diseases / Q000175:diagnosis / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009626:Terminology as Topic