2011
The RF values correlated well with the angiographic semiquantitative scale of severity of aortal insufficiency ( r = 0 . 805 ; p less than 0 . 001 ) , although they enabled the authors only to make a partial differentiation of haemodynamically severe regurgitations and mild or insignificant ones .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None