History of ultrasound in cardiology.
Meyer
Richard A
RA
Division of Cardiology, Children's Hospital Medical Center, Cincinnati, Ohio, USA.
D002309:Cardiology / Q000266:history; D004452:Echocardiography / Q000266:history* / Q000295:instrumentation; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans