19111
Their mean age was 55 . 6 ( +/- 11 . 07 ) years , 55 % were men , 60 % were asymptomatic at diagnosis and 51 % , 38 % and 11 % were of white , black and South Asian / other ethnicity , respectively .
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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