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Career Since 1983 , he has been Professor of European Law at the Katholieke Universiteit Leuven , since 1990 with the title of buitengewoon hoogleraar .
 Katholieke Universiteit Leuven
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Katholieke Universiteit Leuven