A comparison of low-molecular-weight heparin with unfractionated heparin for acute pulmonary embolism. The THESEE Study Group. Tinzaparine ou Heparine Standard: Evaluations dans l’Embolie Pulmonaire - Simonneau, G; Sors, H; Charbonnier, B; Page, Y; Laaban, JP; Azarian, R; Laurent, M; Hirsch, JL; Ferrari, E; Bosson, JL; Mottier, D; Beau, B (N Engl J Med, 1997)