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A total of 1601 cases of ischemic stroke with a mean age of 75 . 6 ( +/- 6 . 7 ) years were identified , among which 933 ( 58 . 3 % ) were female .
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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:
 None