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Previously he has held visiting positions at the Istituto Italiano di Scienze Umane , the University of Florence , the University of Michigan , the University of Illinois , Northwestern University , the European University Institute in Florence , the University of Antwerp , and Leti University at St. Petersburg .
 University of Florence, University of Michigan, University of Illinois, Northwestern University, Florence, University of Antwerp
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Florence, University of Michigan, University of Illinois, Northwestern University, Florence, University of Antwerp