25003
A significant association was found between the longitudinal exposure to MPA ( MPA AUCs = f ( t ) ) and AR ( p = 0 . 0081 ) , and validated by bootstrapping .
 MPA, MPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 MPA, MPA