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The urine fluoride levels of fluorosis patients were significantly higher than control subjects as expected ( 1 . 91 +/- 0 . 15 vs . 0 . 49 +/- 0 . 13 mg / L , respectively ; p < 0 . 001 ) .
 Chemical: fluoride
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fluoride