2037
CONCLUSIONS : In addition to the superiority of octafluoropropane - filled microspheres to air - filled microspheres for LV opacification , the efficacy of OCTA is relatively unaffected by impaired LV function and is less susceptible to the effects of poor echogenicity than AIR .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None