The importance of vasodilator therapy for early radial artery string signs identified by intraoperative angiography during coronary artery bypass surgery - Wildhirt, SM; von Canal, F; Voss, B; Guenzinger, R; Eising, G; Eichinger, WB; Schuetz, A; Bauernschmitt, R; Lange, R (The Thoracic and Cardiovascular Surgeon, 2006)