3278
Single - center short - term RMSCVs were < 1 % for all parameters except cortical thickness ( Ct . Th ) ( 1 . 1 % ) , spatial variability in cortical thickness ( Ct . Th . SD ) ( 2 . 6 % ) , standard deviation of trabecular separation ( Tb . Sp . SD ) ( 1 . 8 % ) , and porosity measures ( 6 % to 8 % ) .
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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