Review Timing of initial administration of low-molecular-weight heparin prophylaxis against deep vein thrombosis in patients following elective hip arthroplasty: a systematic review.
Hull RD, Pineo GF, Stein PD, Mah AF, MacIsaac SM, Dahl OE, Ghali WA, Butcher MS, Brant RF, Bergqvist D, et al. Arch Intern Med. 2001 Sep 10; 161(16):1952-60.