Comparison of enoxaparin and warfarin for the prevention of venous thromboembolic disease after total hip arthroplasty. Evaluation during hospitalization and three months after discharge - Colwell, CW; Collis, DK; Paulson, R; McCutchen, JW; Bigher, GT; Lutz, S; Hardwick, ME (J Bone Joint Surg, 1999)