Guidelines for the performance of a comprehensive intraoperative epiaortic ultrasonographic examination: recommendations of the American Society of Echocardiography and the Society of Cardiovascular Anesthesiologists; endorsed by the Society of Thoracic Surgeons
J Am Soc Echocardiogr. 2007 Nov;20(11):1227-35.
doi: 10.1016/j.echo.2007.09.001.