title: Letter: Postoperative pulmonary embolism.
mesh_terms: D000367:Age Factors; D000368:Aged; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications; D011655:Pulmonary Embolism / Q000453:epidemiology / Q000209:etiology; D014692:Ventilation-Perfusion Ratio