3228
Hyperoxia increased tissue vascularization , altered fracture healing in un - complicated fractures , and improved bone repair in ischemia - induced delayed fracture union .
 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