[Prevention of postoperative venous thrombosis].
D000368:Aged; D001510:Bed Rest / Q000009:adverse effects; D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control; D013924:Thrombophlebitis / Q000517:prevention & control*; D014859:Warfarin / Q000627:therapeutic use
D014859:Warfarin; D006493:Heparin