Non-invasive assessment of coronary flow reserve by transthoracic Doppler echocardiography in the distal part of left anterior descending artery: accuracy for vessel patency in the presence of LBBB - Athanassopoulos, G; Petropoulou, E; Hatzigeorgiou, G; Motsi, A; Karatasakis, G; Cokkinos, D.V. (EUROPEAN HEART JOURNAL, 2004)