title: Prevention of postoperative venous thrombosis.
mesh_terms: D001241:Aspirin / Q000008:administration & dosage; D002986:Clinical Trials as Topic; D006493:Heparin / Q000008:administration & dosage*; D006615:Hip / Q000601:surgery; D006801:Humans; D011183:Postoperative Complications / Q000517:prevention & control*; D013923:Thromboembolism / Q000517:prevention & control; D013924:Thrombophlebitis / Q000517:prevention & control*; D014859:Warfarin / Q000627:therapeutic use
chemical_list: D014859:Warfarin; D006493:Heparin; D001241:Aspirin