11501
This study has shown that compared with continuous ART , interruption of ART results in a reduction in markers of bone turnover and increase in BMD at hip and spine , and that early changes in markers of bone turnover predict BMD changes at 12 months .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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