30475
Using principal components ( PC ) analyses , we identified one summary measure of intracortical and endocortical bone surface areas , cortical porosity and volumetric bone mineral density ( structure PC ) , and one summary measure of bone remodelling markers ( remodelling PC ) .
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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:
 None