Dangerous seats? Crammed into airline economy class, you may be risking blood clots. Here's what you can do.
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D000401:Aircraft / Q000592:standards*; D006801:Humans; D007374:Interior Design and Furnishings; D007866:Leg / Q000098:blood supply*; D011655:Pulmonary Embolism / Q000150:complications; D014195:Travel; D014481:United States; D020246:Venous Thrombosis / Q000209:etiology* / Q000473:pathology