17379
Because ovulation is extremely rare and thought to be unpredictable in women with POI and because no ovulation induction regimens have been shown to be efficacious , oocyte donation is the only evidence - based treatment for women with POI with desired fertility .
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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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