11692
For this purpose , the immediate and the final ( after swelling ) fixation strengths of two variations of the swellable bone anchor designs ( a smooth anchor and a screw anchor ) were measured in two different foams ( used to simulate bone ) with different densities .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None