Effect of early intravenous heparin on coronary patency, infarct size, and bleeding complications after alteplase thrombolysis: results of a randomised double blind European Cooperative Study Group trial - de Bono, D P; Simoons, M L; Tijssen, J; Arnold, A ER; Betriu, A; Burgersdijk, C; Lopez, Bescos L; Mueller, E; Pfisterer, M; Van de Werf, F; Zijlstra, F; Verstraete, M; for the European Cooperative Study Group (Br Heart J, 1992)