3537
Two patient groups were studied : Type I - - with a new ePTFE graft ; and Type II - - with thrombectomy and / or revision of a previously placed ePTFE graft .
 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