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In contrast , the UK Prospective Diabetes Study ( UKPDS ) risk engine overestimated CHD risk ( O / P ratios : 0 . 30 for CHD and 0 . 72 for stroke ) .
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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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