Downing, Stephen W., William R. Herzog, Jr., Michael C. McElroy, and Timothy B. Gilbert. “Feasibility of Off-Pump ASD Closure Using Real-Time 3-D Echocardiography”. The Heart Surgery Forum 5, no. 2 (June 1, 2002): E096-E099. Accessed June 3, 2024. https://journal.hsforum.com/index.php/HSF/article/view/6167.