Patency of Internal Thoracic Artery Compared to Vein Grafts - Postoperative Angiographic Findings in 1189 Symptomatic Patients in 12 Years - Gansera, B; Schmidtler, F; Angelis, I; Kiask, T; Kemkes, B M; Botzenhardt, F (The Thoracic and Cardiovascular Surgeon, 2007)