title: Prevention of recurrent venous thrombosis: warfarin versus heparin.
mesh_terms: D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D012008:Recurrence; D013924:Thrombophlebitis / Q000175:diagnosis / Q000517:prevention & control*; D014859:Warfarin / Q000627:therapeutic use
chemical_list: D014859:Warfarin; D006493:Heparin