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Flowchart of data analysis. Review of efficacy and safety of venous thromboembolism (VTE) prophylaxis in 3896 patient undergoing major orthopaedic surgery (MOS) between 2006 and 2009. LMWH = low molecular weight heparin; UFH = unfractionated heparin; aXa day−1= anti Factor Xa units day–1; OD = once daily; BID = twice daily; TID = three times daily; GFR = glomerular filtration rate; RBC = packed red blood cell concentrates
