Letter: Postoperative pulmonary embolism.
D003949:Diagnostic Techniques, Surgical; D006801:Humans; D011183:Postoperative Complications / Q000453:epidemiology*; D011300:Preoperative Care; D011655:Pulmonary Embolism / Q000175:diagnosis / Q000453:epidemiology*; D014692:Ventilation-Perfusion Ratio