11444
Most of cases ( n : 65 , 52 % ) were aged over 30 years , while the mean age was 34 . 87 +/- 19 . 29 years .
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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