1740
The 1 - yr mortality was significantly higher after aprotinin treatment in the high risk surgery group ( 17 . 7 % vs 9 . 8 % , P = 0 . 034 ) .
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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:
 None