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Direct thrombin inhibitors are appropriate , evidence - based alternatives to heparin in patients with a history of HIT , who need to undergo percutaneous coronary intervention .
 Chemical: Direct thrombin inhibitors; Chemical: heparin; Disease: HIT
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Direct thrombin inhibitors; Chemical: heparin; Disease: HIT