Reduction of plasma levels of prothrombin fragments 1 and 2 during thromboprophylaxis with a low-molecular-weight heparin - Sorensen, J V; Lassen, M R; Borris, L C; Rahr, H B; Jensen, H P; Hoppensteadt, D; Walenga, J A; Fareed, J (Blood Coag Fibrinol, 1992)