337280
Historically , vessels — such as the great saphenous vein in the leg or the radial artery in the arm — were obtained using a traditional " open " procedure that required a single , long incision from groin to ankle , or a " bridging " technique that used three or four smaller incisions .
 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