The thromboprophylactic effect of a low-molecular-weight heparin (Fragmin) in hip fracture surgery. A placebo-controlled study. - Jorgensen,P.S.; Knudsen,J.B.; Broeng,D.L.; Josephsen,L.; Bjerregaard,P.; Hagen,D.K.; Jorgensen,P.K.; Torholm,C. (Clin Orth Rel Research, 1992)