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Moreover , the coefficients between paired results for blood lead and serum creatinine and blood lead and serum urea nitrogen were positively statistically significant ( serum creatinine vs . blood lead , r = 0 . 35 , p < 0 . 05 ; serum urea nitrogen vs . blood lead , r = 0 . 48 , p < 0 . 05 ) .
 Chemical: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen
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: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen