Hamman, Baron L., and Cory H. White. “A Novel Device for Clampless Proximal Anastomosis in OPCAB Surgery: The IPAD”. The Heart Surgery Forum 7, no. 5 (January 4, 2005): E374-E375. Accessed December 3, 2020. https://journal.hsforum.com/index.php/HSF/article/view/1211.