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Moreover , elderly men with bioavailable estradiol levels below the median [ 40 pmol / liter ( 11 pg / ml ) ] had significantly higher rates of bone loss and levels of bone resorption markers than men with bioavailable estradiol levels above 40 pmol / liter .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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