Schwitter J, De Marco T, Kneifel S, Von Schulthess M, Jorg C, Arheden H, Ruhm S, Stumpf K, Buck A, Parmley WW, Luscher TF, Higgins C. Magnetic resonance-based assessment of global coronary flow and flow reserve and its relation to left ventricular functional parameters: a comparison with positron emission tomography. Circulation