17675
Here , an overview of CSDs is given that includes the specifications of varying models , a discussion of current scaffold and bone graft designs , and current outcome measures used to determine the extent of bone healing .
 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