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We retrospectively reviewed the medical charts of 127 operative ovarian lesions including 30 ovarian torsions ( 23 . 6 % ) treated in two pediatric centers over a 10 - year period .
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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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