29497
The Cost - Effectiveness of Oral Direct Factor Xa Inhibitors Compared with Low - Molecular - Weight Heparin for the Prevention of Venous Thromboembolism Prophylaxis in Total Hip or Knee Replacement Surgery .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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