TIMI frame count: a quantitative method of assessing coronary artery flow - Gibson, C.M; Cannon, C.P; Daley, W.L; Dodge, J.T; Alexander, B; Marble, S.J; McCabe, C; Raymond, L; Fortin, T; Poole, W.K; Braunwald, E; for the TIMI 4 Study Group (Circulation, 1996)