Low-dose heparin prophylaxis and pulmonary embolism.
D000328:Adult; D004305:Dose-Response Relationship, Drug; D006493:Heparin / Q000008:administration & dosage*; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control; D011655:Pulmonary Embolism / Q000517:prevention & control*
D006493:Heparin