96
Oxidative stress index ( OSI ) was significantly higher in fluorosis group than in control group ( 11 . 5 +/- 3 . 8 vs . 8 . 8 +/- 3 . 7 , respectively ; p < 0 . 001 ) .
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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