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All women who attended the infertility clinic during this period were screened for hyperprolactinemia and only women with hyperprolactinemia and infertility were further studied for the presence of macroprolactin by polyethylene glycol precipitation assay .
 Chemical: polyethylene glycol
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: polyethylene glycol