title: The logistic problems encountered in the multicenter trial of low-dose heparin prophylaxis.
mesh_terms: D000328:Adult; D000368:Aged; D002986:Clinical Trials as Topic; D003201:Computers; D004305:Dose-Response Relationship, Drug; D006470:Hemorrhage / Q000175:diagnosis; D006493:Heparin / Q000627:therapeutic use*; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control; D011655:Pulmonary Embolism / Q000175:diagnosis / Q000401:mortality / Q000517:prevention & control*; D013924:Thrombophlebitis / Q000175:diagnosis
chemical_list: D006493:Heparin