15138
The presence of Aa was observed in 17 % of the children and it significantly increased in high PbB compared with low PbB children at tooth 46 ( OR = 5 . 53 , 95 % CI : 1 . 68 - 18 . 15 ; p = 0 . 005 ) .
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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