24891
To compare bone structure , stiffness and failure load , measured at the peripheral skeleton , between men with and without COPD after stratification for areal bone mineral density ( aBMD ) , and 2 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None