Cold pressure test induced changes in distal left anterior descending artery flow by tranthoracic echo: relationship with non endothelium dependent vasodilatory flow reserve - Athanassopoulos, G; Galderisi, M; Sidiropoulos, M; D'errico, A; Karatasakis, G; Cokkinos, D.V. (EUROPEAN HEART JOURNAL, 2008)