19880
These scaffolds are evaluated whether a combination of collagen nanofibers with PCL / beta - TCP can promote osteogenesis in a mastoid obliteration .
 Chemical: PCL; Chemical: beta - TCP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PCL; Chemical: beta - TCP