Echocardiographic Evaluation of the Left Atrium and Left Atrial Appendage Function in Patients with Atrial Septum Aneurysm - Implications for Thromboembolic Complications - Goch, A; Banach, M; Piotrowski, G; Szadkowska, I; Goch, J H (The Thoracic and Cardiovascular Surgeon, 2007)