Prevention of pulmonary embolism.
D000368:Aged; D005081:Exercise Therapy; D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D011187:Posture; D011655:Pulmonary Embolism / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*
D006493:Heparin