4394
Urine samples were analysed by nanoHPLC - q - TOF , followed by principal component analysis ( PCA ) and Student ' s t - test ( p < 0 . 05 ) .
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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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