title: Selective triphasic prevention of thromboembolism.
mesh_terms: D005342:Fibrinolysis; D006487:Hemostasis; D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D008875:Middle Aged; D013923:Thromboembolism / Q000517:prevention & control*; D014914:Whole Blood Coagulation Time
chemical_list: D006493:Heparin