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BACKGROUND : The interruption of oral anticoagulant ( OAC ) administration is sometimes indicated in patients with mechanical heart valves , mainly before noncardiac surgery , non - surgical interventions , and pregnancy .
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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:
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