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This article provides a critical literature review of the relationship between PCOS and the incidence of estrogen - dependant gynecological tumours , and it then discusses whether the commonly cited risk factor association can be substantiated by high quality studies which comply with the requirements of " evidence - based medicine . "
 Chemical: estrogen
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: estrogen