| http://www.w3.org/ns/prov#value | - TAGS: CARDIOVASCULAR | DIESEL FUMES | EXERCISE | MYOCARDIAL ISCHEMIA | HEART ATTACK Pulmonary Embolism 7/2/2007 A pulmonary embolism is a blood clot that breaks off from the walls of a vein and travels through the circulation to the heart and eventually the lungs.
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