Prevention of venous thrombosis.
D000368:Aged; D059685:Herniorrhaphy; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control*; D013923:Thromboembolism / Q000517:prevention & control; D013924:Thrombophlebitis / Q000517:prevention & control*