166294
It can evaluate central ( abdominal ) and peripheral arteries and vein s ; it helps determine the amount of vascular stenosis ( narrowing ) or occlusion ( complete blockage ) within an artery ; it assists in ruling out aneurysmal disease ; and it is the main aid to rule out thrombotic events .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None