30474
For 95 monozygotic twin pairs aged 40 - 61 years , we measured internal cortical surface areas and structure of the distal tibia using high resolution peripheral computed tomography , and three circulating bone remodelling markers .
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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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