14993
The oldest age - group ( mean age 12 . 8 years ) was represented by 2 , 490 patients ( 42 . 18 % ) with a biphasic dawn - dusk pattern ( BC ) .
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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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