21814
We used an automated segmentation algorithm to determine total bone area ( Tt . Ar ) , cortical BMD ( Ct . BMD ) , porosity ( Ct . Po ) and thickness ( Ct . Th ) , and we applied finite element analysis to HR - pQCT scans to estimate bone strength .
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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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